Answer:
27 inches
Explanation:
consider the diagonal 45 inches as A C [the hypotenuse of the right angled triangle 
 
A B C] and the base 36 inches as A B and the height as B C 
 
By Pythagoras Theorem, 
 
AB2+BC2=AC2 
 
(36)2+BC2=(45)2 
 
BC2=(45)2−(36)2 
 
BC2=(45+36)(45−36)[usingtheformulaa2−b2=(a+b)(a−b)] 
 
BC2=81∗9 
 
BC=81∗9−−−−−√ 
 
BC =9∗3=27inches 
 
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so it would equal 27