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9 Area, Perimeter and Volume MEP Y9 Practice Book B - CIMT

9.3 Perimeter of Special Shapes In this section we calculate the perimeters of various shapes. The perimeter of a circle is referred to as the 'circumference'. The circumference, C, of a circle = 2πr or πd where r is the radius and d is the diameter of the circle. Example 1 Calculate the circumference of a circle with radius 8 cm. Solution