The sum of the angles of a parallelogram?

The property of the angles of a triangle is known that the sum of all its angles is 180 °. Since a parallelogram consists of two such triangles, the sum of the angles of the parallelogram will be 180 ° + 180 ° = 360 °. The angles of the parallelogram that are adjacent to one side add up to 180 °.

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