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2016-03-04T10:05:36+05:30

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180° angle is a angle of a straight line
you didn't need any protector , use your scale to draw a straight line and then make a point randomly on that line . then point your compass on make a semicircle . that's your 180 angle.
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2016-03-04T10:40:47+05:30

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180° = straight line 
Draw a straight line and make a semicircle of any radius on tht line.
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