Question

In right triangle PQR where R is the right angle, PQ=13, QR=12, what is the length of PR ?

Answer 1

a^2+b^2=c^2

that is the equation for finding one length when you know two others. in the formula, C is the hypotenuse. since we know that R is the right angle, and the hypotenuse is always opposite the right angle, then we know that PQ is the hypotenuse. so we get:

a^2 + 12^2 = 13^2
now we solve

a^2= 13^2 - 12^2
a^2 = 169 - 144
a^2 = 25
a=5

so the length of PR is 5

Answer 2

wow. thanks for the help(: