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10–4Area of TrianglesMAIN IDEA• Find the areas oftriangles.EXAMPLES Find the Area of a TriangleFind the area of each triangle.By counting, you find that the measureKEY CONCEPTArea of a Triangle Thearea A of a triangle isone half the product ofthe base b and its heighth.A = bh _2A =×___2of the base is units and theheight is units.Area of a triangleReplace b with and h with .A = __2Simplify the numerator.A =Divide.The area of the triangle is .8 cmA = bh _2A =16 cm×___2A = __2A =Area of a triangleReplace b with and h with .Simplify the numerator.Divide.Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.The area of the triangle is .250 Math Connects, Course 1
10–4®ORGANIZE ITWrite the formula for thearea of a triangle on yourFoldable.Check Your Progressa. b.Find the area of each triangle.EXAMPLEBANNER Ari cut out a banner inthe shape of a triangle. What isthe area of the banner?A =Area of a triangleA = Replace b with and h with .Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.HOMEWORKASSIGNMENTPage(s):Exercises:A =A =The area of the banner isSimplify the numerator.Divide.square inches.Check Your Progress Rachael decides to purchase atriangular pennant to hang on her bedroom wall as a souvenirof the baseball game she attended. If the base of the pennant is9 inches and the height is 25 inches, how many square inchesof her wall will be covered by the pennant? Round to thenearest tenth.Math Connects, Course 1 251
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ContentsCopyright © Glencoe/McGraw
Page 7 and 8:
1-5 Algebra: Variables and Expressi
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C H A P T E R1 Number Patterns and
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Chapter 1 BUILD YOUR VOCABULARYVoca
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1-2 Prime FactorsMAIN IDEA• Find
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1-3Powers and ExponentsMAIN IDEA•
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1-4 Order of OperationsMAIN IDEA•
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1-4ORGANIZE ITOn the Lesson 1-4 tab
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1-5REMEMBER ITIn algebra, thesymbol
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1-6EXAMPLE Find the Rule for a Func
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1-8 Algebra: EquationsMAIN IDEA•
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1-9Algebra: Area FormulasMAIN IDEA
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Chapter 1 BRINGING IT ALL TOGETHER1
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C H A P T E R1ChecklistARE YOU READ
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P T A E RH C2BUILD YOUR VOCABULARYT
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2-1 Problem-Solving Investigation:M
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2-2Step 1 Decide on a scale and . T
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2-2Check Your Progress SNOWFALL Mak
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2-3Check Your Progress INCOME The a
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2-4ORGANIZE ITUnder Lesson 2-4 in y
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2-5 Line PlotsEXAMPLE Display Data
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2-6 MeanMAIN IDEA• Find the mean
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2-7 Median, Mode, and RangeMAIN IDE
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2-7ORGANIZE ITUnder Lesson 2-7 in y
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2-8EXAMPLESSelect an appropriatetyp
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2-9Check Your ProgressGraph -5 on a
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Chapter 2 BRINGING IT ALL TOGETHERW
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C H A P T E R3Operations with Decim
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3-1Representing DecimalsMAIN IDEA
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3-2Comparing and Ordering DecimalsM
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3-3 Rounding DecimalsEXAMPLE Round
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3-4 Estimating Sums and Differences
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3-4Read the ItemThe addends are clu
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3-5WRITE ITExplain in your ownwords
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3-6 Multiplying Decimals by Whole N
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3-7Multiplying DecimalsEXAMPLES Mul
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3-8Dividing Decimals by Whole Numbe
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3-9EXAMPLES Zeros in the Quotient a
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3-10 Problem-Solving Investigation:
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C H A P T E R4BUILD YOUR VOCABULARY
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4-1A Plan for Problem SolvingMAIN I
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4-1EXAMPLESWRITE ITWhy is the great
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4-2BUILD YOUR VOCABULARY (pages 86-
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4-3 Mixed Numbers and Improper Frac
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4-4 Problem-Solving Investigation:M
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4-5EXAMPLE Find the LCMREVIEW ITWhy
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4-6ORGANIZE ITSummarize ways you ca
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4-7 Writing Decimals as FractionsMA
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4-8 Writing Fractions as DecimalsMA
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4-9Algebra: Ordered Pairs and Funct
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4-9EXAMPLESPETS Amelia feeds her do
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Chapter 4 BRINGING IT ALL TOGETHERM
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C H A P T E R5Operations with Fract
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5-1 Rounding Fractions and Mixed Nu
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5-2Problem-Solving Investigation: A
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5-3®ORGANIZE ITUse the note cards
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5-4Check Your Progresssimplest form
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5-5 Adding and Subtracting Mixed Nu
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5-5REMEMBER ITUse estimation tochec
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5-6REMEMBER ITPlacing fractions ona
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5-7EXAMPLE Simplify Before Multiply
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5-8Check Your Progress WEIGHT A bag
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5-9Find 5 ÷ 1 _6 .5 ÷ 1_6 = _ 5
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5-10EXAMPLEADVENTURE RACING A team
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C H A P T E R6BUILD YOUR VOCABULARY
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6-1 Ratios and RatesMAIN IDEA• Ex
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6-2 Ratio TablesMAIN IDEA• Use ra
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6-2BUILD YOUR VOCABULARY (pages 144
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6-3FOOD You can buy 3 medium pizzas
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6-4Algebra: Solving ProportionsEXAM
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6-4EXAMPLE Solve Using Unit RatesWA
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6-6 Sequences and ExpressionsMAIN I
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6-6EXAMPLETEST EXAMPLE The table sh
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6-7Write an equation to find the to
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C H A P T E R6BRINGING IT ALL TOGET
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C H A P T E R7Percent and Probabili
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7-1Check Your Progress Write each p
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7-2Circle GraphsMAIN IDEA• Sketch
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7-2Which two methods of transportat
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7-3EXAMPLES Write a Decimal as a Pe
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7-5Sample SpacesBUILD YOUR VOCABULA
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7-6REVIEW ITUse mental math to solv
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7-8 Estimating with PercentsMAIN ID
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7-8EXAMPLETEST EXAMPLE Clairesurvey
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C H A P T E R8Systems of Measuremen
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Page 208 and 209: 8-1Check Your Progress CRAYONS Meas
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Page 214 and 215: 8-4Check Your Progress Write the me
Page 216 and 217: 8-6 Changing Metric UnitsEXAMPLES C
Page 218 and 219: 8-7Measures of TimeEXAMPLE Add Unit
Page 221 and 222: 8-8EXAMPLES Give Reasonable Tempera
Page 223 and 224: Chapter 8 BRINGING IT ALL TOGETHER8
Page 225 and 226: C H A P T E R8ChecklistARE YOU READ
Page 227 and 228: C H A P T E R9BUILD YOUR VOCABULARY
Page 229 and 230: 9-1 Measuring AnglesMAIN IDEA• Me
Page 231 and 232: 203015030150170109-2Estimating and
Page 233 and 234: 9-3Angle RelationshipsMAIN IDEA•
Page 235 and 236: 9-4 TrianglesBUILD YOUR VOCABULARY
Page 237 and 238: 9-4EXAMPLES Classify a Triangle by
Page 239 and 240: 9-5BUILD YOUR VOCABULARY (pages 219
Page 241 and 242: 9-7 Similar and Congruent FiguresMA
Page 243 and 244: 9-7EXAMPLE Identify Similar Figures
Page 245 and 246: Chapter 9 BRINGING IT ALL TOGETHER9
Page 247 and 248: P T A E RH C9ChecklistARE YOU READY
Page 249 and 250: C H A P T E R10BUILD YOUR VOCABULAR
Page 251 and 252: 10-1PerimeterMAIN IDEA• Find the
Page 253 and 254: 10-2Circles and CircumferenceMAIN I
Page 255 and 256: 10-2Check Your Progress Use a calcu
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Page 261 and 262: 10-6Volume of Rectangular PrismsMAI
Page 263 and 264: 10-7Surface Area of Rectangular Pri
Page 265 and 266: C H A P T E R10BRINGING IT ALL TOGE
Page 267 and 268: Chapter 10 BRINGING IT ALL TOGETHER
Page 269 and 270: C H A P T E R11Integers and Transfo
Page 271 and 272: 11-1 Ordering IntegersEXAMPLE Compa
Page 273 and 274: 11-2Adding IntegersEXAMPLES Add Int
Page 275 and 276: 11-2KEY CONCEPTAdding Integers The
Page 277 and 278: 11-3WRITE ITThink about the numberl
Page 279 and 280: 11-4Multiplying IntegersEXAMPLES Mu
Page 281 and 282: 11-6Dividing IntegersEXAMPLES Divid
Page 283 and 284: 11-6EXAMPLETEST EXAMPLE A scuba div
Page 285 and 286: 11-7point SStep 1 Start at the orig
Page 287 and 288: 11-8EXAMPLE Graph a TranslationTran
Page 289 and 290: 11-9 ReflectionsMAIN IDEA• Graph
Page 291 and 292: 11-10 RotationsMAIN IDEA• Graph r
Page 293 and 294: C H A P T E R11BRINGING IT ALL TOGE
Page 299 and 300: C H A P T E R12Algebra: Properties
Page 301 and 302: 12-1The Distributive PropertyMAIN I
Page 303 and 304: 12-2Simplifying Algebraic Expressio
Page 305 and 306: 12-3Solving Addition EquationsMAIN
Page 307 and 308: 12-1 12-3BUILD YOUR VOCABULARY (pag
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12-4BUILD YOUR VOCABULARY (page 292
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12-5EXAMPLE Solve a Multiplication
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C H A P T E R12BRINGING IT ALL TOGE
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Chapter 12 BRINGING IT ALL TOGETHER
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