Question

In the figure O is the centre of the circle. OB = 5 cm, Distance from O to chord AB is 3 cm. Find the length of AB.

Answer 1

$O{P}^2+P{B}^2=O{B}^2$

$\Rightarrow 9+P{B}^2=25$

$\Rightarrow PB=4$

$\therefore AB=8cm$

Hence, the answer is $8cm.$