Identifying and Classifying Polygons

This video tutorial introduces polygons, explaining that they are closed shapes made of line segments meeting at endpoints. It distinguishes polygons from non-polygons, which may have curved lines or open segments. The video analyzes various shapes, identifying their characteristics, and discusses plane shapes, emphasizing their two-dimensional nature. Different types of polygons, such as triangles, quadrilaterals, pentagons, hexagons, octagons, and decagons, are explored, highlighting their sides and angles. The lesson concludes by encouraging viewers to identify polygons around them and introduces the next topic on intersecting lines.

What defines a polygon?

• A closed shape made up of only curved lines

• A shape with any closed outline

• A closed shape made up of line segments that meet only at their endpoints

• An open shape made up of line segments

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CCSS.2.G.A.1

Which of the following is NOT a polygon?

• A rectangle

• A shape with sides that do not meet

• A triangle

• A hexagon

Tags

CCSS.2.G.A.1

Which shape is considered a polygon?

• Oval

• Circle

• Pentagon

• Shape with curved lines

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CCSS.2.G.A.1

What is a vertex in the context of polygons?

• The point where two sides meet

• A type of polygon with six sides

• The longest side of a triangle

• A curved line in a circle

What is a quadrilateral?

• A polygon with three sides

• A polygon with four sides

• A polygon with five sides

• A polygon with six sides

Tags

CCSS.2.G.A.1

How many angles does a hexagon have?

• 10

• 8

• 4

• 6

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CCSS.2.G.A.1

How many sides does a decagon have?

• 12

• 10

• 6

• 8

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CCSS.2.G.A.1

What is true about all polygons?

• They cannot have angles

• They are made of line segments that meet at endpoints

• They can be open shapes

• They must have curved lines

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CCSS.2.G.A.1

What distinguishes a plane shape?

• It cannot have straight lines

• It exists on a flat surface

• It is always a polygon

• It has three dimensions

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CCSS.1.G.A.1

CCSS.2.G.A.1

Which statement is true about polygons?

• All closed shapes are polygons

• Polygons can have sides that do not meet

• Polygons are always plane shapes

• Polygons must have at least one curved side

Tags

CCSS.2.G.A.1