Question

the areas of two circles are in the ratio 16:25. find the ratio of their circumference

Answer 1

Hi ,

Let r and R are radii of two circles ,

Ratio of their areas = 16 : 25

πr² : πR² = 16 : 25

r² / R² = ( 4/5 )²

r / R = 4/5-----( 1 )

Ratio of circumferences = 2πr / 2πR

= r / R

= 4/5

[ From equation ( 1 ) ]

= 4 : 5

I hope this helps you.

:)

Answer 2

Answer:

16:25

r square/r square =(4/5)

r/R=4/5

ratio of circumference=2pi.r/2pi.r

=r/R

=4/5

answer is 4/5