Question

A circular wire of radius 7cm is cut and bent again into an arc of a circle of radius 12cm what is the angle subtended at the centre

Answer 1

So, the length of the arc = circumference of the wire with radius 7 cm = 2pi*7 = 14pi cmradius of the arc = 12 cm Hence, length of arc = angle/360 * 2pi(radius)14pi = angle/360 *2*pi*12angle = 210 degree