the circumference of a circle is 123 CM taking π= 22/ 7 (I) radius of the circle in c m (ii)the area of the circle in cm square correct to the nearest CM square (iii) the effects and the area of the circle if the radius is doubled
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(1) Circumference = 2πr
123=2×22/7×r
123×7=2×22×r
861/44=r
r=19cm
(2)Area of circle= πr2
22/7×19×19
1135cm2
(3) Double = 22/7×38×38
4538cm2
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