find the circumference of the circles given that. a radius = 21mm
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Step-by-step explanation:
circumference = 2pir
a) 2pir = 2× 3.14 × 21 mm = 131.88mm
b) r = d/2 = 14 cm/2 = 7
2pir = 2× 22/7 × 7 = 44cm
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