Answer
The length of the hypotenuse is 35 feet.
Explanation
This is the formula to find the hypotenuse.
[tex]l^{2} + l^{2} = h^{2}[/tex]
One leg is 21 feet. The other is 28 feet. Now insert those into the formula.
[tex]21^{2} + 28^{2} = h^{2}[/tex]
[tex]h^{2}=1225[/tex]
Now to find what h is you should find the square root of 1225.
[tex]\sqrt{1225} =35[/tex]
So the length of the hypotenuse is 35 feet.
