Question

What is the perimeter of the following polygon?

Answer
22 units
28 units
36 units
44 units

Answer 1

perimeter = 13+13+10 = 36

Answer 2

use pyth thm to find the unknown length

Answer 3

This problem can be reduced to mental math if you recognize the 5-12-13 right triangles. Not as common as the 3-4-5 triangles, but they show up in textbook problems often enough that knowing them is a good thing.