construct a angle abc in which ab is equal to AC is equal to 5.2 cm and angle a is equal to 120 degree draw Ad perpendicular BC
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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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