SOLUTION: Find the area of a rectangle with length 4 and diagonal 5.

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Question 107334: Find the area of a rectangle with length 4 and diagonal 5.
Answer by elima(1433) About Me  (Show Source):
You can put this solution on YOUR website!
Find the area of a rectangle with length 4 and diagonal 5.
You need to start by finding the width of the rectangle, you do that by the Pythagorean theorem. One leg = 4, hypotenuse=5;
a%5E2%2Bb%5E2=c%5E2
4%5E2%2Bb%5E2=5%5E2
4%5E2-5%5E2=b%5E2
sqrt%2816-25%29=sqrt%28b%29
b=sqrt%289%29 so the width would be 3;
Now we can find the area;
A=LW
A=4(3)
A=12
:)