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AND FLAGS 165 Measuring the size of angles A protractor, the instrument used to measure angles, has three basic parts, the base line. CORE 2 AAB 106 where the base line 100 110 60 90 80 70 60 000 120 130 140 150 a centre meets the 90° line. an inside and outside scale. outside scale 1050 30 20 150 140 130 120 110 100 170 160 750 inside scale 1160 170 180 centre base line Two steps are involved in measuring angles. Step 1 100 110 120 Place the base line on the lower arm of the angle and the centre on the vertex of the angle. 50 60 40 140 ... COZ OL 150 140 130 120 100 100 50 170 180 150 30 20 10 150 160 170 ...
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