find the circumference and the area of the circles with :
diameter = 4.2cm
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Circumference of a circle = 2πr
= 2*22/7*2.1
= 2*22*0.3
= 13.2cm
Area of circle = πr^2
= 22/7* (2.1)^2
= 22/7* 44.1
=1446.70 cm^2
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