Question

What is the length of AC?

Answer 1

This is where you use Pythagoras theorem, which is:

a^2 + b^2 = c^2
25^2 + 16^2 = c^2
881 = c^2
(And then square root it to get c)
C = 29.7cm

Answer 2

a^2 + b^2 = c^2
25^2 + 16^2 = c^2
881 = c^2
c = ~29.68