Geometry Connections

Geometry Connections
Lesson 2.1.4
Name:
Angles in a Triangle
Review & Preview (Page 92)
2-38 Find all missing angles in the diagrams below.
a. b.
75
30
85
110
2-39 Robert believes the lines graphed at right are perpendicular,
but Mario is not convinced. Find the slope of each line, and
explain how you know whether or not the lines are
perpendicular.
y
x
2-40 The diagram at right represents only half of a
shape that has the graph of y 1 as a line of
symmetry. Draw the completed shape, and
label the coordinates of the missing vertices.
y
x

2-41 Janine measured the sides of a rectangle and found that the sides were 12 inches
and 24 inches. Howard measured the same rectangle and found that the sides
were 1 foot and 2 feet. When their math teacher asked them for the area, Janine
said 288, and Howard said 2. Why did they get two different numbers for the
area of the same rectangle?
2-42 Graph this system of equations on graph paper. Then state the solution to the
system. If there is not a solution, explain why.
y 2 5 x 1
y 2 5 x 2