It is proved that .
The opposite sides of a parallelogram are congruent.
From the given figure, it can be observed that and are opposite sides of a .
The opposite angles of a parallelogram are congruent.
From the given figure, it can be observed that and are opposite angles of a .
If two sides and the included angle of one triangle are congruent to two sides and included angle of another triangle, then the triangles are congruent.
Here, , and , then by SAS postulate .
As , then by corresponding parts of congruent triangles, .
Hence it is proved that .
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