Question

the area of two circles are in the ratio 9:16 find the ratio of their circumfrence ​

Answer 1

Let A1 = 9 and A2 = 16

Area of A1 / Area of A2 = 9 / 16

pi*r1^2 / pi*r2^2 = 9/16

r1 / r2 = 3 / 4

Now circumference is given by 2*pi*r

C1 : C2

= 2*pi*r1 : 2*pi*r2

= 2*pi*3 : 2*pi*4

= 3 : 4

Ratio of circumference is 3 : 4.

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Answer 2

Answer:

3/4

Step-by-step explanation:

πR² / πr² = 9/16

R² / r² = 9/16

R / r = 3/4

2πR/2πr = 3/4

hence circumferences are in ratio = 3 : 4