This document defines and describes different types of quadrilaterals. It states that a quadrilateral is a polygon with four sides, four vertices, and four angles whose interior angles sum to 360 degrees. It then describes parallelograms as quadrilaterals with two pairs of parallel sides, and specifies rectangles, rhombi, and squares as special types of parallelograms. Trapezoids are defined as quadrilaterals with only one pair of parallel sides, and kites as quadrilaterals where two pairs of consecutive sides are congruent.

1. QUADRILATERALS

2. QUADRILATERAL
● A quadrilateral is a
polygon with four sides,
four vertices and four
angles.
● The sum of measures of
their interior angles is
360°.

4. PARALLELOGRAM
● Is a quadrilateral with two pairs of parallel sides. Its opposite
sides are parallel and congruent. The opposite angles are also
equal.

5. SPECIAL CASES OF
PARALLELOGRAMS

6. RECTANGLE
● Aside from having two pairs of parallel sides that are
congruent, a rectangle has four right angles.

7. RHOMBUS
● It has four congruent sides.

8. SQUARE
● It has four congruent sides and four equal angles.

9. TRAPEZOID
● Is a quadrilateral with only one pair of parallel sides. Its
nonparallel sides may or may not be congruent. When its
nonparallel sides are congruent, it is an isosceles trapezoid.

10. KITE
● Is a quadrilateral with two pairs of sides that are congruent.
Unlike parallelograms, its congruent sides are consecutive
(next to each other).