If a piece of wire 40 cm long is bent into a arc of a circle subtending an angle of 60 degree at the center, then what is the radius of the circle?
Circumference of the circle formed after extrapolating the section is 40cm × 6 because 60 degrees × 6 = 360 degrees (making one circle) = 240 cm
This circle circumference = 2×pie×radius = 240 cm
Therefore radius = ( 120/pie )cm.
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