Question

What is the length of EF ?

Answer 1

Perimeter is the sum of all outside dimensions.

Solve for x first:

12 + x+7 + x+2 + 5 + x +4 + x + 4 = 42

Combine like terms:

4x + 34 = 42

Subtract 34 from both sides:

4x = 8

Divide both sides by 4:

X = 2

Now solve for EF by replacing x:

EF =. X + 7 = 2 + 7 = 9 feet.