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Quadrilateral
A flat shape with four straight sides. (closed)

rhombus
A quadrilateral where all sides have equal length. It is a type of parallelogram.

square
A quadrilateral where all sides have equal length, and every interior angle is a right angle (90 degrees). Special rectangle.

rectangle
A quadrilateral where all angles are right angles (90°). Also opposite sides are parallel and of equal length.

trapezoid
A quadrilateral that has a pair of opposite sides parallel.

parallelogram
A quadrilateral with straight sides where opposite sides are parallel and equal.

polygon
A two-dimensional shape with straight sides.

regular polygon
A polygon is regular when all angles are equal and all sides are equal (otherwise it is "irregular").

irregular polygon
A polygon that does not have all sides equal and all angles equal.

Parallelogram
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Trapezoid
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Rectangle
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Quadrilateral
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Rhombus
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Rectangle
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Rhombus
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Parallelogram
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Isosceles trapezoid
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Quadrilateral
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A quadrilateral with two pair of parallel sides
Definition of a Parallelogram
A quadrilateral with one pair of parallel sides
Definition of a trapezoid
A quadrilateral with all sides congruent
Definition of a rhombus
A parallelogram with four 90 degree angles.
Definition of a rectangle
A trapezoid with one 90 degree angle
Definition of a right trapezoid
A trapezoid with congruent non-parallel sides
Definition of an isosceles trapezoid
Rectangle, Rhombus, Square
Three types of parallelograms
parallel lines
lines in the same plane that never intersect

perpendicular lines
Lines that intersect to form right angles

360 degrees
The interior angle sum of any quadrilateral is ___.