whats a quadrilateral with 2 sides not parallel and 2 sides parallel
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No. To be a polygon a figure must be "closed", that is, enclose an area. At least three line segments are required to enclose an area.
A polygon.
No. A triangle is a two-dimensional polygon (flat figure). It has sides that consist of three line segments, with an interior area. Only a three-dimensional form (polyhedron) can have faces. Triangles serve as faces for any number of polyhedrons, such as pyramids.
the area is that 2 dimensional space inside of the closed figure. normally specified as square centimeters or square inches
Area