Question

Question 7 (ii)
In a right triangle ABC, B =90^o.
If AC= 13cm, BC = 5 cm, find AB.

Answer 1

(b) Using Pythagoras theorem,

$A{C}^2=A{B}^2+B{C}^2\Rightarrow (13{)}^2=A{B}^2+(5{)}^2\Rightarrow 169=A{B}^2+25\Rightarrow A{B}^2=169-25\Rightarrow A{B}^2=144\Rightarrow AB=12cm$