Use the formula area = pi x radius2. The radius is half the diameter.
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The area of a circle that has diameter of 3 cm is: 7.069 cm2
The area of a 3-inch diameter circle is about 7.068 square inches.
A 3 centimeter diameter circle has an area of 7.068 cm2
Area of a circle = pi x (radius)2And radius = diameter / 2 = 3/2 = 1.5So, area = pi x (1.5)2 = 7.06858347 cm2
1) the diameter of a circle = 2*its Radius. 2) the circumference of a circle = Pi*its diameter (where pi = approx 3.14). 3) the area of a circle = Pi*its radius squared.