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

1 Answer
Anish M.
Mar 27, 2018

21.98

Explanation:

A quick formula for this,
Arc length = #(theta/360)*2piR#

Where #theta# is the angle it subtends and #R# is radius

So, arc length = #(60/360)*2piR#

=#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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