Question

5. The ratio of the radil of two wheels is 2.5. What is the ratio of their circumferences?​

Answer 1

Answer: 2: 5

It's remain same

Step-by-step explanation:

Answer 2

Correct Question :

The ratio of the radii of two wheels is 2:5 . What is the ratio of their circumferences?

Correct Answer :

Let the Radius of 1st and 2nd wheel is R1 and R2 respectively.

According to question ,

$\frac{R2}{R2} = \frac{2}{5} \\ now \: circumference \: of \: circle = 2\pi \: r \: \\ \frac{circumference \: of \: circle \: with \: radius \: R1}{circumference \: of \: circle \: with \: radius \: R2} = \frac{2\pi \: R1}{2\pi \: R2} \\ (2\pi \: will \: get \: cancelled \: ) \\ so \: we \: got \: \\ \\ \frac{circumference \: of \: circle \: with \: radius \: R1}{circumference \: of \: circle \: with \: radius \: R2} = \frac{R1}{R2} \\ \\ \frac{circumference \: of \: circle \: with \: radius \: R1}{circumference \: of \: circle \: with \: radius \: R2} = \frac{2}{5} \: \:$

R1/R2 = 2/5 ( given )

So the ratio of circumferences of two circles is 2 : 5 .

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