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## PowerPoint Slideshow about ' Regular Polygons' - jara

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### Regular Polygons

9.3.1.2 Compose and decompose two- and three-dimensional figures; use decomposition to determine the perimeter, area, surface area and volume of various figures.

Guiding Question: How do we find the perimeter and area of regular polygons?

- Lesson Obj: IWBAT to find the perimeter and area of regular polygons.

Examples of polygons: Pentagon, Hexagon, Octagon, Decagon, etc.

Regular: All sides are congruent and all angles are congruent.

Guiding Question: How do we find the perimeter and area of regular polygons?

For any polygon

Find the sums

Sum of all angles in a polygon is equal to the number of sides minus 2 times 180.

Sum =

What is the sum of the angles in a

Pentagon?

Hexagon?

Octagon?

Guiding Question: How do we find the perimeter and area of regular polygons?

To find the area of a regular polygon.

The apothem is similar to a height.

Guiding Question: How do we find the perimeter and area of regular polygons?

Guiding Question: How do we find the perimeter and area of regular polygons?

- How can we find the perimeter and area of this hexagon?
- Is 8 the apothem?

Guiding Question: How do we find the perimeter and area of regular polygons?

How can we find the perimeter and are of this pentagon?

A STOP sign is 30 inches from top to bottom, can we figure out the area and perimeter?

Guiding Question: How do we find the perimeter and area of regular polygons?

- Assignment: Polygon WS

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