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a heptogon is a seven sided hexogon
A quadrangle is a shape with 4 angles, such as a square, rectangle, or paralellogram. A four sided shape is called a quadrilateral.
A pentagon is a five-sided figure.
A 3 dimensional triangle is called a pyramid, otherwise a 2D three sided polygon shape is exactly what you called it, a triangle.
To look at it, you could never tell it from a circle.