STEPS OF CONSTRUCTION :
1. Draw a circle of radius 4 cm taking O as center.
2. Draw radii OA and OB such that ∠OAB = 120°
3. Draw perpendicular at points A and B and suppose the point they intersect is P.
4. PA and PB are required tangents with ∠APB = 60°
In quadrilateral AOBP , By angle sum property of quadrilateral
∠OAP + ∠OBP + ∠APB + ∠AOB = 360°
90 + 90 + ∠APB + 120 = 360
∠APB = 60°
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