Question

Find the circumference of the circle whose radius is 10.5 cm

Answer 1

$\huge\bold\red{Solution :\longrightarrow}$

$<b><font face=Copper black size=4 color=green>$Given,

Radius of the circle = 10.5 cm

•°• Circumference of the circle

$\large\bold{ = 2\pi {r}^{}}$

$\large\mathfrak{ = (2 \times \frac{22}{7} \times 10.5) \: \: cm}$

$\large\mathfrak{= (2 \times 22 \times 1.5) \: \:cm}$

$\large\mathfrak{ = 66 \: \: cm} \: \: \: \: \bold{\boxed{\boxed{\boxed{Ans}}}}$

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Answer 2

$\textbf{since, Radius of a circle (r) }$= 10.5 cm

And, we know that,

${Circumference\: of\: a\: circle}$ = 2 × π × r

$\mathfrak{so,\: substituting\: the \:value \:of\: "r"\: and}$ "π" as , π = $\frac{22}{7}$

= 2 × $\frac{22}{\cancel7}$ × $\cancel{10.5}$

$\red{Divide\: 10.5\: by\: 7}$ ,so 10.5 ÷ 7 = 1.5

= 2 × 22 × 1.5

Multiply, 2 × 22 = 44,

= 44 × 1.5

Now, multiply the reaming term, i.e., 44 × 1.5 = 66.0,

= $\blue{\boxed{\bold{\underline{66\: cm}}}}$ (ANSWER)

$\textbf{Thus, circumference of the circle is 66 cm}$