Answer:
204 mi
Explanation:
First we need to find the value of a using the Pythagorean theorem
a^2 + b^2 = c^2
a^2 + 68^2 = 85^2
a^2 +4624=7225
a^2 = 7225-4624
a^2 =2601
Take the square root of each side
sqrt(a^2) =sqrt(2601)
a =51
P = sum of all three sides
P = 51+68+85
=204