#1**0 **

Alright, so first set up the equation a^2+b^2=c^2

In this equation AR equals a, so put 7 in for a. GA equals c, so put 10 in for c.

You get 7^2+b^2=10^2

From that you get 49+b^2=100

Minus 49 from both sides to get b^2=51

We know that the square root of 51 will be an irational number, so GR is the square root of 51.

You can solve it from there.

IAmJeff Apr 1, 2019

#2