Question

Q2A) The ratio of radius of two circles is
3:4 . Find the ratio" of their area
​

Answer 1

Step-by-step explanation:

radius of circles = 3:4

area = πr2 = π9

area of 2nd = πr2 = π16

ratio of area =9:16

Answer 2

Answer:

let the radius of first and second circles be 3x and 4x.

area of first circle = πr²

= π(3x)²

area of second circle = πr²

= π(4x)²

so, ratio = π(3x)² : π(4x)²

= 9x² : 16x²

= 9 : 16

here, π and x² both are cancelled by each other.

hence, the ratio of their area's is 9 : 16.

I hope it will help full to you.

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