Question

need help with my maths question

Answer 1

Because it is a right triangle, you can use Pythagoras' Theorem to find x.
13^2 - 6^2 = x^2
169 - 36 = x^2
133 = x^2
√
11.53 = x
11.53 to 3 significant figures is 11.5, so your answer is 11.5cm. I hope this helps!