Question

a circle has a radius of 21cm. find its circumfrence and area use (x=2/7)​

Answer 1

Answer:

circumference =2πr

2×22/7×21

=132cm

Area of a circle =πr'2

22/7×21×21

=1386cm'2

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Answer 2

ANSWER

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Given, radius r = 21 cm and π =

$22 \\ 7$

Then,

Area of the circle = πr

${?}^{2} \: sq \: units$

=

$22 \\7 \times 21 \times 21$

= 22 x 3 x 21

=

$1368cm ^{2}$