The ratio of the radii of two circles is 4:5. Find the ratio of their areas. Find the ratio of their circumferences also.

Dear Student,

Let radii of the circles are r1 and r2 respectively.Given ratio of the radii of two circles, r1r2=45So,Ratio of their areas=πr12πr22=r12r22=r1r22=452=1625Ratio of area of two circle is 16:25And,Ratio of their circumference=2πr12πr2=r1r2=45Ratio of circumference of two circle is 4:5

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