A.
Step by step; Use the pythagorean theorem. (a^2 + b^2 = c^2 )
To find G-J;
7^2 + 3^2 = c^2
49 + 9 = c^2
58 = c^2
square both sides to isolate C, and the square root of 58 doesn’t simplify so we leave it alone.
sqr58
To find G-H;
4^2 + 7^2 = c^2
16 + 49 = c^2
65 = c^2
This, same as last time, 65 doesn’t simplify. Leave it.
sqr65
To find J-H;
3^2 + 4^2 = c^2
9 + 16 = c^2
25 = c^2
Finally, one that simplifies! Square root 25.
5