Math, asked by faizanazrien, 1 year ago

the ratio between circumference of 2 circles is 4:9.find the ratio between their areas

Answers

Answered by mysticd
1
ratio of two circles radii = r:R

ratio of circumferences of two circles = 4:9

2*pi*r/2*pi*R = 4:9

r/R =4:9-----(1)

ratios of areas of two circles = pi*r²/pi*R²

= r²/R²
= (r/R)²
[from (1)]

= (4/9)²
= 16/81

= 16:81


Similar questions