Question

What is the area of a circle with a diameter of 21 centimeters?


use 3.14 for pi

Answer 1

346.185 cm²

Explanation:

radius = diameter / 2

Area of a circle = πr²

radius = 21/2 = 10.5

Area = 3.14(10.5)²

Area = 346.185 cm²

Answer 2

346.4 square centimeters (cm²)