This worksheet is about finding the areas of circles, given their diameters.
You must learn this important formula for a circle of radius, r :
Area of a circle = π r2
Remember that the radius is HALF the diameter.
Find the area of a circle of diameter 12 cm.
First work out the radius, which will be 12 ÷ 2 = 6 cm
Area = π r2 = π x 62 = π x 36 = 113.1 cm2 (1 dp)