Question

find the circumfrence of a circle of diameter 21 cm take pi =22/7​

Answer 1

Step-by-step explanation:

circumference if circle = 2πr we know that diameter =2r

=2 x 22/7 x 21/2

=66

Answer 2

${\tt{\red{\underline{\underline{\huge{Answer:- \: 66}}}}}}$

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$\LARGE{\bf{\underline{\underline\color{blue}{GIVEN:-}}}}$

• Diameter = 21cm
• $\sf\green{We \: know \: that \: radius \: is \: double \: of \: diameter}$
• So, radius = 21/2
• Radius = 10.5

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$\LARGE{\bf{\underline{\underline\color{purple}{Formula :-}}}}$

$\begin{gathered}\begin{gathered}: \implies \underline{ \boxed{\displaystyle \sf \bold{\: Circumference \: = \: 2\pi \: r }} }\\ \\\end{gathered}\end{gathered}$

$\begin{gathered}\begin{gathered}: \implies \displaystyle \sf \: Circumference \: = \: 2 \: \times \: \frac{22}{7} \: \times \: 10.5 \\ \\ \\\end{gathered}\end{gathered}$

$\begin{gathered}\begin{gathered}: \implies \displaystyle \sf \: Circumference \: = \: \frac{462}{7} \: \\ \\ \\\end{gathered}\end{gathered}$

$\begin{gathered}\begin{gathered}: \implies \underline{ \boxed{\displaystyle \sf \bold{\: Circumference \: = \: 66 }} }\\ \\\end{gathered}\end{gathered}$

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