Calculate the area of a circle with
A. Radius 10cm
B. Diameter 12cm (take π as ²²/⁷)
A. Given radius = 10 cm
Area of a circle = π x radius²
Area = ²²/⁷ x 10²
Area = ²²/⁷ x 100
Area = 314.29 cm²
Therefore, the area of the circle with radius 10 cm is 314.29 cm².
B. Given diameter = 12 cm
Radius = Diameter/2 = 12/2 = 6 cm
Area of a circle = π x radius²
Area = ²²/⁷ x 6²
Area = ²²/⁷ x 36
Area = 113.14 cm²
Therefore, the area of the circle with diameter 12 cm is 113.14 cm².