Question

The leg of a right triangle is 5 units and the hypotenuse is 8 units. What is the length, in units, of the other leg of the triangle?

Answer 1

you Use the Pythagorean theorem:
a^2+b^2=c^2
a^2+5^2=8^2
a^2+25=64  then Subtract 25 from both sides: and 
a^2=39