I WONDER - What Is A Convex Octagon?

The video tutorial explains that internal angles of a shape should not exceed 180 degrees. If any internal angle is greater than 180 degrees, the shape is considered concave. A mnemonic to remember this is that 'concave' has a 'cave' in it, indicating an inward angle.

What is the maximum internal angle in a shape for it to be considered non-concave?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

What happens to a shape when any of its internal angles exceeds 180 degrees?

• It becomes a triangle

• It is still non-concave

• It is considered concave

• It becomes a polygon

Explain what a concave angle is in your own words.

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List the characteristics that define a concave shape.

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How can you remember the definition of a concave shape?

• Think of a cave

• Think of a square

• Think of a circle

• Think of a triangle