Convex and Concave Polygons

This video tutorial teaches students how to identify convex and concave polygons. Convex polygons have all sides pushed outward, while concave polygons have at least two sides pushed inward. The teacher provides examples of each type and offers mnemonic devices to help remember the differences. The lesson concludes with a review of key terms and a homework assignment to draw examples of both types of polygons.

What is the main focus of this lesson?

• Identifying different types of polygons

• Learning about convex and concave polygons

• Understanding the history of polygons

• Exploring the uses of polygons in architecture

Which of the following is a characteristic of a convex polygon?

• All sides are pushed inward

• At least two sides are pushed inward

• At least one side is pushed outward

• All sides are pushed outward

Which shape is NOT an example of a convex polygon?

• Star with some sides inward

• Hexagon with all sides outward

• Square with all sides outward

• Triangle with all sides outward

What is another term for concave polygons?

• Regular polygons

• Convex polygons

• Irregular polygons

• Non-convex polygons

How many sides must be pushed inward for a polygon to be considered concave?

• At least two sides

• At least one side

• All sides

• No sides

Which of the following is an example of a concave polygon?

• A star with some sides inward

• A square with all sides outward

• A triangle with all sides outward

• A hexagon with all sides outward

What mnemonic device is suggested to remember concave polygons?

• Think of a snow dome with a roof that caves in

• Visualize a flat piece of paper

• Imagine a balloon expanding outward

• Consider a solid cube

What is the key difference between convex and concave polygons?

• Convex polygons have all sides pushed outward

• Concave polygons have all sides pushed outward

• Convex polygons have sides pushed inward

• Concave polygons have no sides pushed inward

What activity is suggested for the next class?

• Drawing a convex and a concave polygon

• Writing an essay on polygons

• Building a 3D model of a polygon

• Researching the history of polygons

What tool is recommended for drawing polygons for the next class?

• A ruler

• A compass

• A protractor

• A calculator