Geometric shape formed by two rays (initial and ending sides of the angle) that share a common endpoint called the vertex. You may name an angle using the vertex, or a point in each ray and the vertex label in the center.
Any quadrilateral with two pairs of opposite sides parallel.
It is a closed plane figure with a least three straight segments as sides.
A four-sided polygon.
A quadrilateral whose angles are all right angles.
Line segment; A section of a line, defined by two end points and all the points between them.
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