how to construct 180 degree angle using compass and ruler
 

Hi, 

Mark a point ‘O’ on a straight line ‘l’.

:

(i)  With ‘O’ as center draw arcs of any radius to cut the line l at A and B.

(ii)  Now  angle AOB  =  180°.

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first, construct a 90-degree angle using compass and ruler.
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be bisecting [3 times]
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You don't need a compass to do this you just need a ruler. A 180 degree angle is a straight line.
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HELLO
TO CONSTRUCT A 180 DEGREE ANGLE MARK A POINT ( D ) SET YOUR COMPASS AND MAKE PART OF A CIRCLE. BISECT THE SAME CIRCLE THREE TIMES YOU GET A 180 DEGREE ANGLE.
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