Let us draw a quarter turn and work on it.

Think about the other words of point and hands.

Apply isosceles triangle property

What do we know about sum of all the angles of a parallelogram.

What do you know about opposite angles of a parallelogram?

What is the sum of three angles of a triangle?

Angle sum property of quadrilateral

What is the sum of three angles of a triangle?

Think about the other words of point and hands.

What do you know about opposite angles of a parallelogram?