Page 1 1. Construct the following angles with the help of a protractor: 45 o , 67 o , 38 o , 110 o , 179 o , 98 o , 84 o Solution: Construct a ray OA. Now place the protractor on the ray OA such that its centre coincides with point O and the diameter coincides with OA. Mark a point B against the mark of 45 o on the protractor. Remove the protractor and construct the line OB where ?AOB is the required angle. In the same way draw the angles 67 o , 38 o , 110 o , 179 o , 98 o and 84 o Page 2 1. Construct the following angles with the help of a protractor: 45 o , 67 o , 38 o , 110 o , 179 o , 98 o , 84 o Solution: Construct a ray OA. Now place the protractor on the ray OA such that its centre coincides with point O and the diameter coincides with OA. Mark a point B against the mark of 45 o on the protractor. Remove the protractor and construct the line OB where ?AOB is the required angle. In the same way draw the angles 67 o , 38 o , 110 o , 179 o , 98 o and 84 o 2. Draw two rays PQ and RS as shown in Fig. 19.14 (i) and (ii). Using protractor, construct angles of 15 o and 138 o with one arm PQ and RS respectively. Solution: (i) Construct a ray PQ as given in the question. Now place the protractor on PQ such that its centre coincides with the point P and the diameter coincides with PQ. Mark B against the mark of 15 o on the protractor. Construct PB by removing the protractor. Page 3 1. Construct the following angles with the help of a protractor: 45 o , 67 o , 38 o , 110 o , 179 o , 98 o , 84 o Solution: Construct a ray OA. Now place the protractor on the ray OA such that its centre coincides with point O and the diameter coincides with OA. Mark a point B against the mark of 45 o on the protractor. Remove the protractor and construct the line OB where ?AOB is the required angle. In the same way draw the angles 67 o , 38 o , 110 o , 179 o , 98 o and 84 o 2. Draw two rays PQ and RS as shown in Fig. 19.14 (i) and (ii). Using protractor, construct angles of 15 o and 138 o with one arm PQ and RS respectively. Solution: (i) Construct a ray PQ as given in the question. Now place the protractor on PQ such that its centre coincides with the point P and the diameter coincides with PQ. Mark B against the mark of 15 o on the protractor. Construct PB by removing the protractor. Here ?QPB is the required angle of 15 o . (ii) Construct a ray RS as given in the question. Now place the protractor on RS such that its centre coincides with the point R and the diameter coincides with RS. Mark T against the mark of 138 o on the protractor. Construct ST by removing the protractor. Here ?RST is the required angle of 138 o .Read More

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