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The radius of the circle whose arc of length 15 π cm makes an angle of 3π/4 radian at the centre is

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At 3:40, the hour and minute hands of a clock are inclined at

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If the arcs of the same length in two circles subtend angles 65° and 110° at the centre, then the ratio of the radii of the circles is

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If OP makes 4 revolutions in one second, the angular velocity in radians per second is

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A circular wire of radius 7 cm is cut and bent again into an arc of a circle of radius 12 cm. The angle subtended by the arc at the centre is