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What is the shape of this math problem in the fifth grade of primary school?
It is a parallelogram.

Two groups of opposite sides are parallel respectively.

The two groups of opposite sides are equal respectively.

The two groups are diagonally equal (that is, diagonally equal).

The sum of internal angles is 360 degrees (the sum of internal angles of all quadrangles is 360 degrees)

A large angle plus a small angle equals 180 degrees.