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Question

Select the correct answer.

This coordinate plane shows the shape of a hang glider. The perimeter of the glider is to be trimmed with a special material. What is the minimum length of material needed?

A. 

54 feet

B. 

58 feet

C. 

64 feet

D. 

78 feet

Answer 1

The bottom horizontal line is 24 feet

The two side vertical lines are 2 feet long each (4 feet long total)

The two slanted lines are of equal length, so you just need to us the distance formula to find one of them

The endpoints of the one on the left is (0,2) and (12,7)

Using the distance formula sqrt((12-0)^2 + (7-2)^2) = 13, so length of the two slanted lines total is 26 feet.

perimeter is the sum of the lengths of the sides = 24 + 4 + 26 = 54 feet (A).