Question

if the circumference of a circle is 45 cm. find its radius . explanation step by step
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Answer 1

Circumference = 45 cm(Given)

pi× r×r = 45 cm

22/7 × r× r =45

r×r = 45× 7/22

=14.32 cm

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Answer 2

$\huge \bf{\underline{Question}}$

If the circumference of a circle is 45cm. Find its radius.

$\huge\bf{ \underline{Answer}}$

Given:

• Circumference of a circle is 45cm.

To find:

• Radius of a circle.

Formula required:

$\sf{ \fbox{circumference \: of \: circle=2πr}}$

where,

$\small \fbox{r = radius \: of \: circle}$

According to Question:

∵circumference of circle=2πr

$\small{∴45cm=2 \times \frac{22}{7} \times r}$

$\small{∴ \frac{45 \times 7}{2 \times 22} = r}$

$\small \fbox{∴ r = 7.16}$

Hence, radius of circle is approximately 7 cm.

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