Classifying Polygons by Perpendicular Lines

This video tutorial teaches how to classify polygons by observing the presence or absence of perpendicular lines. It begins with a review of what constitutes a polygon and provides examples of polygons and non-polygons. The concept of perpendicular lines, which form right angles, is explained. The tutorial then demonstrates how to classify polygons based on the number of pairs of perpendicular sides they have, using various shapes as examples. The lesson concludes with practical examples and a summary of the key points covered.

What defines a polygon?

• A figure with disconnected line segments

• A closed figure made up of line segments

• An open figure

• A shape with curved lines

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CCSS.2.G.A.1

Which of the following is not a polygon?

• A shape with all sides connected

• A closed figure made up of straight lines

• A shape with curved lines

• A figure with four right angles

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CCSS.2.G.A.1

What are perpendicular lines?

• Lines that intersect at obtuse angles

• Lines that never intersect

• Lines that form square corners

• Lines that run parallel to each other

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

What is the characteristic feature of perpendicular lines?

• They are parallel

• They intersect at acute angles

• They do not intersect

• They form square corners

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

How many pairs of perpendicular sides does a square have?

• Two pairs

• Three pairs

• Four pairs

• One pair

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CCSS.5.G.B.4

How many pairs of perpendicular sides does a right triangle have?

• No pairs

• Three pairs

• One pair

• Two pairs

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CCSS.3.G.A.1

Which shape has no pairs of perpendicular sides?

• Square

• Rectangle

• Right triangle

• Rhombus

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CCSS.4.G.A.2

Which polygon can have one, two, or three pairs of perpendicular sides?

• Pentagon

• Rectangle

• Rhombus

• Square

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CCSS.4.G.A.2

How do we sort polygons in this lesson?

• By the number of sides

• By their size

• By their color

• By the number of pairs of perpendicular sides

Which real-world object was mentioned to have four pairs of perpendicular sides?

• A computer

• A wooden frame

• A textbook

• A wooden piece

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CCSS.1.G.A.1

CCSS.2.G.A.1