Question

the circumference of a circle is 22 cm.find the radius and area of the circle

Answer 1

as the circumference of the circle is given by 2πr
so
22=2*π*r
=> r= 22*7/44
=> r=3.5cm

so area. of the circle is
π*r*r
i.e.
22/7*3.5*3.5
38.5cm²

Answer 2

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given,
2pi r = 22cm

r = 11/pi cm

area of the circle
pi r^2
= pi X 11/ pi X 11 / pi

= 121 / pi cm^2

put the value of pi = 3 .14

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