Area of circle is pi. r.r. Here r = diameter/2. r = 6 cm. area = 22/7 x 6 x 6 = 113.14 cm sq.
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The circumference of a circle if the diameter is 12cm is 37.7cm
12 cm A diameter is twice as long as the radius of a circle. D = 2r D = 2(6cm) = 12cm
The area is 113.1 square cm.
Circumference of a circle = Pi x D c = 3.14159 X 12 c = 37.7 cm _______________________________ Area of a circle = (Pi) r2 A = 3.14159 X (6)2 A = 3.14159 X 36 A = 113.1 cm2
The radius of a circle is the distance from the centre to the edge. The diameter is the distance right across the circle through the centre. So the diameter of a circle is always twice its radius. So if the radius of a circular CD is 6cm, the diameter is twice this - 12cm.