A circular wire of radius 7 cm is cut and bent again into an arc of a circle of radius 12 cm. The angle substended by the arc at the centre is
210∘
Length of the arc of radius
= Circumference of the circle of radius 7 cm
=2πr=14π
Now,
Angle subtended by the arc
=ArcRadius=14π12
=(14π12×180π)∘=210∘