Question

Find the perimeter of a circle having diameter 63cm.

Answer 1

Perimeter of a circle = 2 π r

• $2 \times \frac{22}{7} \times \frac{63}{2}$
• 198cm²

Answer 2

Given :

• Diameter of Circle = 63 cm

To Find :

• Find the Area

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SolutioN :

$\dag$ Formula Used :

• ${\underline{\boxed{\pmb{\sf{ Radius = \dfrac{Diameter}{2} }}}}}$

• ${\underline{\boxed{\pmb{\sf{ Perimeter = 2 \pi r }}}}}$

Where :

• r = Radius

$\dag$ Calculating the Perimeter :

$\begin{gathered} \qquad \; \dashrightarrow \; \; \sf { Perimeter = 2 \pi r } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \dashrightarrow \; \; \sf { Perimeter = 2 \times \dfrac{22}{7} \times \dfrac{63}{2} } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \dashrightarrow \; \; \sf { Perimeter = 2 \times \dfrac{22}{\cancel7} \times \dfrac{\cancel{63}}{2} } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \dashrightarrow \; \; \sf { Perimeter = 2 \times 22 \times \dfrac{9}{2} } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \dashrightarrow \; \; \sf { Perimeter = 44 \times \dfrac{9}{2} } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \dashrightarrow \; \; \sf { Perimeter = \dfrac{396}{2} } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \dashrightarrow \; \; \sf { Perimeter = \cancel\dfrac{396}{2} } \\ \\ \\ \end{gathered}$

$\begin{gathered} \qquad \; \dashrightarrow \; \; {\underline{\boxed{\pmb{\sf{ Perimeter = 198 \; cm }}}}} \; {\pink{\pmb{\bigstar}}} \\ \\ \\ \end{gathered}$

$\therefore \;$ Perimeter of the Circle is 198 cm .

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