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Circumference of a circle = 2πr and diameter d = 2r
therefore circumference = 2d
(a) d = 6.9 cm
circumference = 2 x 6.9 = 13.8 cm
(b) d = 4.2 cm
circumference = 2 x 4.2 = 8.4 cm
(c) d = 630 mm = 630/10 cm = 63 cm
circumference = 2 x 63 = 126 cm
(d) d = 75 cm
circumference = 2 x 75 = 150 cm
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