Hi! Can someone help me please.

Answer:
27 inches
Step-by-step explanation:
We are using the Pythagorean theorem
a^2 +b^2 = c^2 where c is the hypotenuse
We are given the diagonal, which is the hypotenuse and a leg
36^2 + b^2 = 45^2
Subtract 36^2 from each side
36^2 + b^2 - 36^2 = 45^2 - 36^2
b^2 = 45^2 - 36^2
b^2 =2025-1296
b^2 =729
Take the square root of each side
sqrt(b^2) = sqrt(729)
b =27
Step-by-step explanation:
let the perpendicular length be l
[tex]l = \sqrt{ {(45)}^{2} - {36}^{2} } [/tex]
[tex]l = \sqrt{2025 - 1269} [/tex]
[tex]l = \sqrt{729} [/tex]
[tex]l = 27 \: \: inches[/tex]