Note: take r = 22/7
in the above two questions,
(i) Taking r= 3.14, find the circumference of a circle whose radius is
(a) 8 cm
(b) 15 cm
(c)20 cm
(ii) Calculate the radius of a circle whose circumference is 44cm?
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Answer:
(I) circumference of a circle = 2πr
(a) = 2×3.14×8 cm
= 50.24cm
(b) = 2×3.14×15cm
= 94.2cm
(c) = 2×3.14×20 cm
= 125.6cm
(ll) circumference of a circle = 2πr
44cm = 2πr
(44×7)/2×22) = r
r = 7cm
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