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2015-10-30T20:52:09+05:30

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THIS IS THE IMAGE OF 180 DEGREE CONSTRUCTED USING A COMPASS.
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2015-10-30T21:38:27+05:30

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Draw a line OA1
Taking O as centre and OA1 as radius, draw an arc.
Taking A1 as centre, mark point A2
Taking A2 as centre, mark point A3
Taking A3 as centre, mark point A4

Now join O and A4.
angle A1OA4 is 180 degree

see the figure
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