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Question -

Find the angle subtended at the centre of a circle of radius тАШaтАЩ┬а by an arc of length (a╧А/4)┬а cm.



Answer -

Radius of the circle (r) = a cm
Length of arc = a╧А/4┬а ┬аcm
Let ╬╕ be the angle subtended by the arc at the centre, then

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