Question

ratio of radii of 2 circle is 3:5. find the ratio of circumference of these 2 circle

Answer 1

Let the common divisor be x,

Now, We can say that the radii of circles are 3x, 5x respectively,

Circumference of a circle = 2*π*Radius,

Circumference of smaller circle = 2π(3x),

Circumference of bigger circle = 2π(5x)

Ratio of their circumferences = 6πx : 10πx
= 3:5,

So the ratio of Circumferences = 3:5,

Hope you understand, Have a great day !!