Find the unknown side length, x. Write your answer in simplest radical form.

√41

Step-by-step explanation:

Considering the largest triangle,

The unknown side = √[(52)^2 + (40)^2]

= √400

= 20

Considering the second largest,

The unknown side = √[(20)^2 + (12)^2]

= √256

= 16

Considering the the smaller one,

Using pythagoras theorem

Unknown side = 12

The base of the smallest triangle is 16 - 12 = 4

hence x = √[(4)^2 + (5)^2]

= √41

i just took the test, the correct answer is .. 31.5 in.