Question

If the ratio of radii of two circles is 3:5then the ratio of their areas is
(3:5,25:9,9:25)​

Answer 1

Answer:

9:25

Step-by-step explanation:

9:25 is the correct answer because square of the radius ratio of the area

Answer 2

$\underline{\orange{\bold{ Question : }}}$

If the ratio of radii of two circles is 3:5then the ratio of their areas is

$\underline{\green{\bold{Solution : }}}$

Area of 1st circle = π r^2

= 22/7 × 3^2

= 22/7 × 9

= 198/7

Area of 2nd circle = 22/7 × 5^2

= 22/7 × 25

= 550/7

${\blue{Ratio }}$ = 198/7 ÷ 550 /7

= 198 /7 × 7/550

= 198/550

= 47 / 135

= 47 : 135

$\boxed{\red{\bold{ Answer : 47: 135 }}}$

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