Answer:
31.94m
Explanation:
get the hypotenuse of the bigger triangle
13² + 3² = h²
169 + 9 = h²
178 = h²
h = 13.34
also get the hypotenuse of the small triangle
2² + 3² = h²
4 + 9 = h²
13 = h²
h = 3.6
add those two hypotenuses to 15
13.34 + 3.6 + 15 = 31.94