# Maths

Construct a triangle ABC in which AB=AC=5.2cm and angle A= 120 degree. Draw Ad perpendicular to BC. Use ruler and compass.

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1. 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.

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