Question

H=5
r=7200
Solve for d

Answer 1

Use Pythagoras theorem
(h+r)^2 = r^2 + d^2
d^2 = h^2 + 2hr +r^2 - r^2
d^2 = h^2 + 2hr

d^2 = 5^2 + 7200^2 = 51840025
d = sqrt 51840025 = 7200.001736