A circular wire of radius 7 cm is cut and bent again into an arc of a cicle of radius 12 cm. the angle subtended by the arc at the centre is:-

Asked by RAJVEER TIWARI | 15th May, 2013, 12:12: PM

Expert Answer:

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

Answered by  | 15th May, 2013, 07:31: PM

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