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A circle has a area which …

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A circle has a area which is 100 times of another circle what is the ratio of their circumferences

Posted by Pratush Singh 2 years, 1 month ago

CBSE > Class 07 > Mathematics

2 answers

Preeti Dabral 2 years, 1 month ago

$\begin{aligned} & \mathrm{A}_1=100 \mathrm{~A}_2 \\ & \Rightarrow \frac{\mathrm{A}_1}{\mathrm{~A}_2}=100 \\ & \Rightarrow \frac{\pi \mathrm{r}_1^2}{\pi \mathrm{r}_2^2}=100 \end{aligned}$

$\begin{aligned} & \Rightarrow \frac{\mathrm{r}_1}{\mathrm{r}_2}=10 \\ & \text { So, } \frac{\mathrm{c}_1}{\mathrm{c}_2}=\frac{2 \pi \mathrm{r}_1}{2 \pi \mathrm{r}_2} \\ & =\frac{\mathrm{r}_1}{\mathrm{r}_2}=\frac{10}{1} \end{aligned}$

Aadarsh Kumar Singh 2 years, 1 month ago

Pratush kya tum dayanand me study karte the

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