Question

The areas of the two circles are in the ratio 81 : 100, then ratio of their

circumferences are​

Answer 1

Answer:

r1²:r2²=9²:10²

r1:r2=9:10

Ratio of circumferences=r1:r2=9:10 as 2 pai cancel each other

Answer 2

Step-by-step explanation:

Let the radius of the two circles =R1 and R2.

81/100=(22/7×R1²)/(22/7×R2²).

81/100=R1²/R2².

√(81/100)=R1/R2.

9/10=R1/R2.

R1=9.

R2=10.

Ratio of their circumference=(2πR1)/(2πR2).

=R1/R2.

=9/10.

=9:10.

I hope it helps you and BDW my name is Souvik Das.