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Calculating length of an arc

Answer Text:
Calculating length of an arc.
-To calculate the arc length, we use the formulae
Arc length =#theta/360 times 2pir#

Example 1:

Find the length of an arc subtended by an angle of #250^o#at the centre of the circle of radius 14 cm.

Example 2

The length of an arc of a circle is 11.0 cm .Find the radius of the circle if an arc subtended an angle of #90^o# at the center.

Example 3

Find the angle subtended at the center of a circle by an arc of 20 cm, if the circumference of the circle is 60 cm.