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2., Activity-7, OBSE, S.No., TOPIC, Material Required, To verify the relation between the degree measure and the, radian measure of an angle., 1., Drawing board, sketch penn, fevistik, white sheets of, PRE-REQUISITE KNOWLEDGE, 1. Understanding of the concept measure of an angle., 2. Understanding of the concept systems of measurement of, angles., 3. Understanding of the concept of circular system i.e., Radian, and degree measure., 10, 3., paper, geometry box etc., 4., PROCEDURE, 1. Fix a white sheet of paper on a drawing board and draw a circle with the help of compasses., 2. Take a set square on this circle in two different positions to find the diameters, AB and CD, shown in the Fig. 7.2, 3. Let AB and CD intersect each other at O, (the centre of the cirlce). as shown in the Fig. 7.3, ONOS, rigon, A, A, A, Q.1, Ans, D., Q.2, Ans, B, B., Fig. 7.1, Fig. 7.2, Fig. 7.3, Clearly, OA = OB = OC = OD = r (radius of the circle), 3. Here, OX = r, xy = l and 0 be the angle subtended by arc xY at the centre., Q.:, %3D, An, Now,, 1, ZXOY = 0 = - radians, Q., x 360°, then, 2Ttr, An, radians =, 1, x 360°, %3D, 2Ttr, 180, 1 radian =, = 57.27°, Fig. 7.4, JPH Mathematics Lab Manual-XI/ 14