• A A quadrilateralquadrilateral is a four-sided polygon with four angles. There are is a four-sided polygon with four angles. There are many kinds of quadrilaterals. The five most common types are the many kinds of quadrilaterals. The five most common types are the parallelogramparallelogram, the , the rectanglerectangle, the , the squaresquare, the , the trapezoidtrapezoid, and the , and the rhombusrhombus. .

• A A parallelogramparallelogram has two parallel pairs of opposite sides. has two parallel pairs of opposite sides. A A rectanglerectangle has two pairs of opposite sides parallel, and four right has two pairs of opposite sides parallel, and four right

angles. It is also a parallelogram, since it has two pairs of parallel sides.angles. It is also a parallelogram, since it has two pairs of parallel sides.• A A squaresquare has two pairs of parallel sides, four right angles, and all four has two pairs of parallel sides, four right angles, and all four

sides are equal. It is also a rectangle and a parallelogram.sides are equal. It is also a rectangle and a parallelogram.• A A rhombusrhombus is defined as a parallelogram with four equal sides. Is a is defined as a parallelogram with four equal sides. Is a

rhombus always a rectangle? No, because a rhombus does not have to rhombus always a rectangle? No, because a rhombus does not have to have 4 right angles.have 4 right angles.

TrapezoidsTrapezoids only have one pair of parallel sides. It's a type of only have one pair of parallel sides. It's a type of quadrilateral that is not a parallelogram. (British name: (quadrilateral that is not a parallelogram. (British name: (TrapeziumTrapezium))

• Qudrilateral- (Qudrilateral- (quadquad means four, means four, lateral lateral means side).means side).• Any four-sided shape is a QuadrilateralAny four-sided shape is a Quadrilateral. . • But the sides have to be But the sides have to be straightstraight, and it has to be , and it has to be 2-dimensional2-dimensional..

• QuestionsQuestions1.) What are the sides 1.) What are the sides

of the of the quadrilaterals?quadrilaterals?

2.) What are the 2.) What are the angles?angles?

3.) The vertices3.) The vertices

• Answers:Answers:1.)1.)

2.)2.)

3.)3.)

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

5.) Which angles are 5.) Which angles are opposite? opposite? Consecutive?Consecutive?

4.)4.)

5.)5.)

Continuation:Continuation:

5.) If we draw a line 5.) If we draw a line connecting the connecting the opposite vertices,opposite vertices,– How many lines will How many lines will

be formed?be formed?– What kind of lines What kind of lines

are they?are they?– Name these lines.Name these lines.

5.)5.)