since this is a right triangle, you can use the pythagorean theorem:
(a^2+b^2=c^2)
your formula will be:

your hypotenuse will take the place of c. (8) and 6 will take the place of a.
simplify the squares:

subtract 36 from each side:

un-square the b by square rooting 28.
this will come out as a large # that's equal to:
