Question 403586
If a rectangle has an area of 144ft squared, its length is 18 ft, and the width is 8 ft. What is the length of the diagonal? I dont know how to find it.

...
the diagonal and the sides of the rectangle form a right triangle.
Th diagonal D is the hypotenuse and the sides of the rectangle are the legs of the triangle.
...
8^2+18^2= D^2
64+324= D^2
384=D^2

{{{sqrt(D^2)= sqrt(384)}}}

D = 19.6 ft