1. A quadrilateral is a four-sided polygon with four angles. There are many kinds of quadrilaterals. The five most common types are the parallelogram, the rectangle, the square, the trapezoid, and the rhombus. A quadrilateral is a four-sided polygon with four angles. There are many kinds of quadrilaterals. The five most common types are the parallelogram, the rectangle, the square, the trapezoid, and the rhombus.quadrilateralparallelogramrectanglesquaretrapezoidrhombusquadrilateralparallelogramrectanglesquaretrapezoidrhombus A parallelogram has two parallel pairs of opposite sides. A parallelogram has two parallel pairs of opposite sides. A rectangle has two pairs of opposite sides parallel, and four right angles. It is also a parallelogram, since it has two pairs of parallel sides. A rectangle has two pairs of opposite sides parallel, and four right angles. It is also a parallelogram, since it has two pairs of parallel sides. A square has two pairs of parallel sides, four right angles, and all four sides are equal. It is also a rectangle and a parallelogram. A square has two pairs of parallel sides, four right angles, and all four sides are equal. It is also a rectangle and a parallelogram. A rhombus is defined as a parallelogram with four equal sides. Is a rhombus always a rectangle? No, because a rhombus does not have to have 4 right angles. A rhombus is defined as a parallelogram with four equal sides. Is a rhombus always a rectangle? No, because a rhombus does not have to have 4 right angles. Trapezoids only have one pair of parallel sides. It's a type of quadrilateral that is not a parallelogram. (British name: (Trapezium) Trapezoids only have one pair of parallel sides. It's a type of quadrilateral that is not a parallelogram. (British name: (Trapezium) Qudrilateral- (quad means four, lateral means side). Qudrilateral- (quad means four, lateral means side). Any four-sided shape is a Quadrilateral. Any four-sided shape is a Quadrilateral. But the sides have to be straight, and it has to be 2-dimensional. But the sides have to be straight, and it has to be 2-dimensional.

3. Questions Questions 1.) What are the sides of the quadrilaterals? 2.) What are the angles? 3.) The vertices Answers: Answers:1.)2.)3.)

4. 4.) Which sides are opposite? Consecutive or non- opposite? 5.) Which angles are opposite? Consecutive? 4.)5.)

5. Continuation: 5.) If we draw a line connecting the opposite vertices, –How many lines will be formed? –What kind of lines are they? –Name these lines. 5.)