Given, Radius of circumcircle of right angled triangle =10cm

In the right angled triangle, the hypotenuse is the diameter of the circumcircle and its centre is the mid-point of the hypotenuse. i.e., OA=OC=10cm ∴ Hypotenuse =AC=2×(10)=20cm The altitude drawn to the hypotenuse =BO=8cm ∴ Area of the right angled triangle =