Question

Calculate the area of shaded region
Angle AOB=90°

Answer 1

this is correct solution

Answer 2

CO = 14 cm - 5 cm
= 9 cm

angle AOC + angle AOB = 180 degree ( linear pair )
angle AOC + 90 = 180
angle AOC = 90

triangle AOC is a right angle triangle
So,
area of right angle = 1/2 × b × h
= 1/2 × 12 ×9
= 6 × 9
= 54 cm

area of shaded region is 54 cm