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2015-01-11T12:26:41+05:30
Draw a straight line with the help of a ruler 
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2015-01-11T12:33:58+05:30

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By using a ruler and pencil we have to draw a straight line because 180 degrees angle make straight line only. so there is the no use of compass.
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plz mark it as best and say thanks if it helps u. hope that it helps u