if you can construct a 60° angle, you can do one of 120°.
One of the earliest constructions is a perpendicular bisector, so I'm sure you can do that.
So, draw your 120° angle, label it A, and you have the angle bisector already done.
Mark off AB and AC and connect B and C to form BC.
Your angle bisector is also the perp. bisector of BC.
Construct a triangle ABC in which AB=AC=5.2cm and angle A= 120 degree. Draw Ad perpendicular to BC. Use ruler and compass.
4 answers
What do you mean by 'you can do that'. If I could do it then why would I come here to get the answer.
Kumari
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