The diameter of a circle is 28 cm. Find its :
(i) circumference
(ii) area
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If the radius of a circle is doubled, then its area will become :
doubled
halved
four times
three times
The circumference of a circular field is 308 m. Find its :
(i) radius
(ii) area.
The sum of the circumference and diameter of a circle is 116 cm. Find its radius.