Question

the cicumference of a circle is 31.4cm. find the radius and the and the area of the circle? (take pi= 3.14) explain .

Answer 1

circumference of circle
$2\pi \: r$
31.4=2×3.14×r
r=31.4/2×3.14
r=10/2
r=5cm

Answer 2

Hey friend here is your answer....

Circumference of circle = 2πr

ATQ,

2πr = 31.4

2*3.14*r = 31.4

r = 31.4/(2*3.14) = 31.4/6.28 = 5

Hence radius of circle is 5cm

Area of circle = πr^2

3.14 * 5^2 = 3.14*25 = 78.50 cm^2

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