Question

2 Pi R^2-4 Pi R Give your answer ​

Answer 1

Answer:

r=C2π. Explanation: This is the formula for Circumference C of a circle given the radius r , where π=227 or 3.14 or ...

r=C2π Explanation: This is the formula for Circumference C of a circle given the radius r, where π=227 or 3.14 or 3.14159 or 3.1416. Hence C×12π=2πr2π ... More

Answer 2

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$\sf\implies \: \pi {r}^{2} - 4\pi \: r \\ \\ = \: \pi \: r(r - 4) \\ \\ = \frac{22r}{7} (r - 4) \\ \\ = \frac{22 {r}^{2} }{7} - \frac{88r}{7} \\ \\ = \frac{22 {r}^{2} - 88r }{7}$

${\large{\blue{\bold{\underline{Now,}}}}}$

▪︎ To find the value of r.

$\sf\implies \: \frac{22 {r}^{2} - 88r }{7} = 0\\ \\\sf \implies22 {r}^{2} - 88r = 0 \\ \\ \sf\implies22r(r - 4) = 0 \\ \\ \sf\implies22r = 0 \:\: or \: \:( r - 4) = 0 \\ \\ \sf\implies \: r = 0 \: \: \: or \: \: \: r = 4$

• But radius can not be 0.

${\large{\green{\sf{\boxed{\boxed{\bold{=》\:r\:=\:4.}}}}}}}$

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