The radius of a circle is 21cm. An arc of the circle subtends an angle of $60 \circ$ $60@$ at centre. Find the length of the arc?

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The radius of a circle is 21cm. An arc of the circle subtends an angle of $60 \circ$ $60@$ at centre. Find the length of the arc?

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Answer 1 · 2018-03-27T14:36:21

21.98

Explanation:

A quick formula for this,
Arc length = $(\frac{θ}{360}) \cdot 2 π R$ $(theta/360)*2piR$

Where $θ$ $theta$ is the angle it subtends and $R$ $R$ is radius

So, arc length = $(\frac{60}{360}) \cdot 2 π R$ $(60/360)*2piR$

= $21.98$ $21.98$

Note: If you don't want to memorize the formula then think hard about it, you can easily understand its origin and come up with it on your own next time!

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The radius of a circle is 21cm. An arc of the circle subtends an angle of $60 \circ$ $60@$ at centre. Find the length of the arc?

1 Answer

Explanation:

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Impact of this question

Science

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The radius of a circle is 21cm. An arc of the circle subtends an angle of 60∘60@ at centre. Find the length of the arc?

1 Answer

Explanation:

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The radius of a circle is 21cm. An arc of the circle subtends an angle of $60 \circ$ $60@$ at centre. Find the length of the arc?