Fund the length of archana of circle ashich subtends an angle of 90° at centre if radius of circle is 12 cms .
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we know that
angle=arc/radius
angle (in radian)= 90×2×π/360=π/2
π/2=arc/12
arc=π×12/2
arc=6π=18.85cm
angle=arc/radius
angle (in radian)= 90×2×π/360=π/2
π/2=arc/12
arc=π×12/2
arc=6π=18.85cm
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