Quadrilaterals I. Definition Polygon – a closed many straight- sided figure

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Quadrilaterals I

Definition• Polygon – a closed many straight-

sided figure.

Definition• Angle – two rays that meet at a

common end point.

Definition• Degree – a unit of measurement of

an angle or arc, represented by the symbol º.

90º

Definition• Quadrilateral – a polygon with 4

angles and 4 straight sides.

Quadrilateral Family

parallelogramrectangle

rhombus square

trapezoid

Property of quadrilaterals• The sum of all the angles equals

360º degrees.

90º

Property of Quadrilaterals• The sum of all the angles equals

360º degrees.

90º

90º90º90º90º+360º

Property of Quadrilaterals• The sum of all the angles equals

360º degrees.

90º

90º90º90º90º+360º

Property of Quadrilaterals• The sum of all the angles equals

360º degrees.

70º

110º

70º

110º

70º70º110º110º+360º

Property of Quadrilaterals• The sum of all the angles equals

360º degrees.

65º

115º65º

115º

65º65º115º115º+360º

What is the missing angle?

90º

90º90º90º?

360º+

What is the missing angle?

70º

110º

70º70º110º?+

360º

What is the missing angle?

65º

115º65º

?65º65º115º?+

360º

What is the missing angle?

90º

90º90º90º?+

360º

What is the missing angle?

58º81º109º?+

360º81º58º

109º?

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Polygon – a closed many straight-sided figure

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