Question 519957
 20in long . 
diagonal is 25in long

It is rectangular.
The diagonal forms the hypotenuse

Use Pythagoras theorem

leg1^2+leg2^2=hypotenuse^2

25^2+leg2^2=25^2

leg2^2=25^2-20^2
leg 2 = {{{sqrt(25^2-20^2)}}}

leg2 = {{{sqrt(625-400)}}}

leg2= sqrt(225)}}}

leg2 =>width = 15 in

m.ananth@hotmail.ca