Question

The information given represents lengths of sides of a right triangle with c the hypotenuse. Find the correct missing length to the nearest hundredth.

a = ?, b = 13, c = 21

Answer 1

You can use the pythagorean thereom the a^2+b^2=c^2

Just plug in the numbers and solve for a a^2+13^2=21^2

Answer 2

Since a² + b² = c² then
a² = c² -b²
a² = 21² - 13²
a² = 441 - 169
I just thought I'd add my post to make the solution a little easier to follow.
Alex108 - I think you can finish the problem on your own.

Answer 3

a squared plus b squared equals c squared
therefore a squared equals c squared - b squared
21 squared - 13 squared equals 272
then square root 272 = a
a = 16.49