11.2a Area of Regular Polygons CCSSLESSON GOALS  Understand that to find the area of a regular polygon you find the area of one triangle and multiply.

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Presentation transcript:

11.2a Area of Regular Polygons CCSSLESSON GOALS  Understand that to find the area of a regular polygon you find the area of one triangle and multiply that area by the number of sides the polygon has. ESLRs: Becoming Effective Communicators, Competent Learners and Complex Thinkers G GPE 7: Use coordinates to compute perimeters of polygons and areas of triangles and rectangles, e.g., using the distance formula.

definition Center of a Polygon is the center of its circumscribed circle. Radius of a Polygon is the radius of its circumscribed circle.

definition The Apothem of a Polygon is the distance from the center to any side of the polygon. radius apothemapothem

definition Central Angle of a Regular Polygon is an angle whose vertex is the center and whose sides contain two consecutive vertices of the polygon.

definition The Measure of a Central Angle of a Regular Polygon 72 o

Example

Area of a Regular Polygon 1.Divide the polygon into congruent triangles by drawing the radii of the polygon 2.Find the measure of the central angle. 3.Draw the apothem. What happens to the central angle? 4.Find the length of the apothem 5.Find the area of one inner triangle. 6.Multiply by the number of sides.

Area of a Regular Polygon Find the area of a regular hexagon with side length of 4 yds. 1.Divide the polygon into congruent triangles by drawing the radii of the polygon. 4 yds

Area of a Regular Polygon 2.Find the measure of the central angle. 4 yds Find the area of a regular hexagon with side length of 4 yds.

Area of a Regular Polygon 3.Draw the apothem. What happens to the central angle? 4 yds Find the area of a regular hexagon with side length of 4 yds.

Area of a Regular Polygon What happens to the base? 4 yds 3.Draw the apothem. Find the area of a regular hexagon with side length of 4 yds.

Area of a Regular Polygon 4.Find the length of the apothem. 4 yds Find the area of a regular hexagon with side length of 4 yds.

4 yds Area of a Regular Polygon 5.Find the area of one inner triangle. 4 yds Find the area of a regular hexagon with side length of 4 yds.

Area of a Regular Polygon 6.Multiply by the number of sides/triangles. 4 yds Find the area of a regular hexagon with side length of 4 yds.

Area of a Regular Polygon Find the area of a square with a radius 6 units. 1.Divide the polygon into congruent triangles by drawing the radii of the polygon.

Area of a Regular Polygon 2.Find the measure of the central angle. Find the area of a square with a radius 6 units.

Area of a Regular Polygon 3.Draw the apothem. What happens to the central angle? Find the area of a square with a radius 6 units

Area of a Regular Polygon 4.Find the length of the apothem. Find the area of a square with a radius 6 units

Area of a Regular Polygon 5.Find the area of one inner triangle. Find the area of a square with a radius 6 units

Area of a Regular Polygon 6.Multiply by the number of sides/triangles. Find the area of a square with a radius 6 units.

Area of a Regular Polygon The area of a regular polygon can be found using n = the number of sides s = the length of a side a = the length of the apothem P = perimeter of the polygon

p.672: 1 – 5, 9, 10, 16, 18, 22, 30