Question

If circumference of a circle is 13.2cm . Find its radius

Answer 1

If circumference of a circle is 13.2cm . Find its radius

Step-by-step explanation:

r=2.1cm

Answer 2

Given:

• Circumference of a circle is 13.2 cm.

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To find:

• Radius of the circle.

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Solution:

• Let the radius of the circle be r.

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$\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\qbezier(2.3,0)(2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,-2.121)(0,-2.3)\qbezier(2.3,0)(2.121,-2.121)(-0,-2.3)\put(0,0){\line(1,0){2.3}}\put(0.5,0.3){\bf\large r\ cm}\end{picture}$

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Formula used

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$\: \: \: \: \boxed{\bf{\bigstar{Circumference_{(Circle)} = 2 \pi r{\bigstar}}}}$

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$\tt\longmapsto{Circumference = 13.2}$

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$\tt\longmapsto{2 \pi r = 13.2}$

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$\tt\longmapsto{2 \times \dfrac{22}{7} \times r = 13.2}$

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$\tt\longmapsto{r = \dfrac{13.2 \times 7}{2 \times 22}}$

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$\tt\longmapsto{r = \dfrac{92.4}{44}}$

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$\bf\longmapsto{r = 2.1}$

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Hence,

• Radius of the circle is 2.1 cm.