A circle has a diameter of 42 cm- What would be its circumference -A- 120 cmB- 210 cmC- 100 cmD- 132 cm

The correct option is D 132 cmWe know that the circumference of the circle is given by 2π r, nbsp; where r is the radius of the circle. i.e., Circumference=2 ...

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Standard IX

Mathematics

Circle and It's Parts

A circle has ...

Question

A circle has a diameter of 42 cm. What would be its circumference ?

120 cm

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132 cm

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100 cm

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210 cm

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Solution

The correct option is B 132 cm
We know that the circumference of the circle is given by $2 π r,$ where $r$ is the radius of the circle.
i.e., $Circumference = 2 π r = π \times (2 r)$
$= π \times diameter$
$= \frac{22}{7} \times 42$
$= 132 c m$

Suggest Corrections

A circle has a diameter of 42 cm. What would be its circumference ?

The correct option is B 132 cmWe know that the circumference of the circle is given by 2πr, where r is the radius of the circle. i.e., Circumference=2πr=π×(2r) =π× diameter =227×42 =132 cm

The correct option is B 132 cm
We know that the circumference of the circle is given by $2 π r,$ where $r$ is the radius of the circle.
i.e., $Circumference = 2 π r = π \times (2 r)$
$= π \times diameter$
$= \frac{22}{7} \times 42$
$= 132 c m$