It is a square.
Try to draw the same parallelogram.
Think about the diagonals of a triangle.
Firstly, find if it is open or closed curve.
An equilateral triangle has equal sides and equal angles.
A regular polygon is equiangular and equilateral.
Recall the properties of each quadrilateral.
The curves do not cut each other.
What are the properties of regular polygon?
Recall properties of trapezium
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