SOLUTION: find the length of a rectangle: given the width is 3 inches long and the diagonal is 20 inches long

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Question 480812: find the length of a rectangle:
given the width is 3 inches long
and the diagonal is 20 inches long
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
Use the Pythagorean theorem w%5E2%2Bl%5E2=d%5E2 where w- width, l- length, d-diagonal
l%5E2=d%5E2-w%5E2
l%5E2=20%5E2-3%5E2400-9=391
l=sqrt%28391%29=19.77inches