Area = 1/2 × NMP angle in radian × radius^2
Area = 1/2 × ( 40pi /180 ) × 12^2
Area = 1/2 × ( 2pi / 9 ) × 144
Area = 1/2 × 144 × ( 2 × 3.14 / 9 )
Area = 72 × 0.697
Area = 50.184
Area = 50.18 cm^2
