4. The circumference of a circle is 123.2 cm.
Calculate :
(i) the radius of the circle in cm;
(ii) the area of the circle to the nearest cm;
(iii) the effect on the area of the circle if the radius is doubled.
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circumference =2×22/7×r.
=radius = 19.6cm.
area = 22/7×19.6^2
area = 1207.36cm^2.
Step-by-step explanation:
effect on area = 22/7×19.2^2×2
effected area = 4829.44cm^2
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