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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Since it subtends 90 degrees at the centre ,it is a quadrant of a circle, so its length is 1/4th of the circumference of the circle
l=1/4(2πr)
= πr/2=3.14*12/2=18.84cm
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