Question

The radii of two circles are in the ratio 4:3 . If
difference between their area is 165sq.cm
d the area of the bigger circle.
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Answer 1

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Perimeter and Area of a Circle

(a) The areas of two circle...

(a) The areas of two circles are in the ratio 4:9. Find the ratio of their circumferences.

(b) The circumference of two circles is in the ratio 3:4. Find the ratio of their areas. 

ANSWER

a) Area of two circles in ratio =4:9

πr12:πr22=4:9

r22r12=94

r2r1=32

Circumference =2πr1:2πr2=2π×32π×2=2:3

Answer = 2:3

b)Circumference of circle ratios =3:4

⟹r2r1=43

Area of circles =πr22πr12=r22r12=4232=169=9:16

Answer = 9:16