Question

∆ABC is right-angled at C. If AC = 5 cm and BC = 12 cm. find the length of AB.

Answer 1

A rough figure will help us.

By Pythagoras property,

AB² = AC² + BC²
AB² = 5² + 12²

AB² = 25 + 144

AB² = 169

AB² = 13²

AB² =13.

So, AB = 13 or the length of AB is 13 cm.