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22 Part I: Technical Mathematics

Table 3.2 Calculation of perimeter and circumference of basic geometric shapes.

Shape Example Formula

Part I.C

Rectangle

w

P = 2l + 2w

l

Square

s

P = 4s

s

Parallelogram

a

P = 2a + 2b

Trapezoid

b

a

P = a + b + c + d

c

d

b

Regular hexagon

(all sides

equal length)

P = 6s

r

s

Right triangle

P = a + b + c

a

c

Note: a 2 + b 2 = c 2

(Pythagorean theorem)

b

Triangle

a

c

P = a + b + c

b

Continued

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