Posted by Candice on Friday, December 9, 2011 at 9:47pm.
A circular piece of wire has a radius of 12 cm. This is cut then bent to form an arc of a circle whose radius is 60 cm. Find the angle subtended at the centre by this arc. Give your answer to the nearest degree.
Please show working out
Thank you so much!

Math  Reiny, Friday, December 9, 2011 at 10:17pm
the circumference of the original circle becomes the arc length of the sector.
circumf. of circle = 2πr = 24π
arc = rØ, were Ø is the central angle in radians and r is the radius
so if r = 60
60Ø = 24π
Ø = 24π/60 radians = 2π/5 radians
I know π/5 radians = 36° , so
2π/5 radians = 72°
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