Question

Two concentric circle have a common centre O. The chord circle touches the smaller circle at P. If OP = 3 cm and AB = 8 cm then find the radius of the bigger circle .

Answer 1

Answer:

Two concentric circle have a common centre O. The chord circle touches the smaller circle at P. If OP = 3 cm and AB = 8 cm.

Then it makes a right angled triangle,

$r = \sqrt{ {3}^{2} + {4}^{2} } = 5$

Radius of bigger circle is 5 cm.