1. A plane figure with four sides and four angles.
*Quadrilateral
A plane figure with four sides and four angles.
Today we are going to learn about five special types of quadrilaterals and their properties.

2. Parallelogram Opposite sides are parallel and congruent
*Parallelogram Opposite sides are parallel and congruent. Opposite angles are congruent.

3. Rectangle Parallelogram with four right angles
*Rectangle Parallelogram with four right angles. Opposite sides are parallel and equal length.

4. Rhombus Parallelogram with four congruent sides
*Rhombus Parallelogram with four congruent sides. Opposite sides are parallel and opposite angles are equal.

5. Square Rectangle with four congruent sides
*Square Rectangle with four congruent sides. Equal sides, four right- angles.

6. Trapezoid Quadrilateral with exactly two parallel sides
*Trapezoid Quadrilateral with exactly two parallel sides. May have two right angles. 

7. Quadrilaterals
Parallelogram
Rectangle
Rhombus
Square .
Trapezoid

8. Parallelogram Rectangle Rhombus Square Trapezoid
Parallelogram with opposite sides that are parallel and equal length.
Rectangle
Parallelogram with four right angles. Opposite sides are parallel and equal length.
Rhombus
Parallelogram with four congruent sides. Opposite sides are parallel and opposite angles are equal.
Square
Rectangle with four congruent sides. Equal sides, four right-angles.
Trapezoid
Quadrilateral with exactly two parallel sides. May have two right angles. 

13. Four-sided shape where all sides have equal length
Four-sided shape where all sides have equal length. Also opposite sides are parallel and opposite angles are equal.

14. Has one pair of opposite sides parallel
Has one pair of opposite sides parallel. Not a parallelogram because only one pair of sides is parallel.

15. A four-sided shape where every angle is a right angle (90˚).
Opposite sides are parallel and equal.

16. Four-sided shape where every angle is a right angle
Four-sided shape where every angle is a right angle . Opposite sides are parallel and equal length.