March 16 trig with regular polygons

Find the area.

• 891 units²

• 99 units²

• 198 units²

• 1782 units²

Find the area.

• 310.4 units²

• 77.6 units²

• 620.8 units²

• 38.8 units²

What is the formula for area of a regular polygon.

• ½⋅apothem⋅perimeter

• a² + b² = c²

• πr²

• √x²+y²

Which is the apothem?

• AD

• AB

• CD

• CB

This polygon is

• Regular pentagon

• Regular hexagon

• Irregular pentagon

• Irregular hexagon

The apothem of a 40-sided regular polygon is 11.4 meters. What is its area if each side measures 1.9 meters?

• 216.6 m²

• 433.2 m²

• 866.4 m²

• 1732.8 m²

What is the area of a regular octagon having an apothem of 13.3 meters and a side length of 11 meters?

• 585.2 m²

• 1170.4 m²

• 292.6 m²

• 2340.8 m²

REGULAR in math terms means...

• Normal

• Two sides have the same length

• All sides are equal and all angles are equal

• It has right angles

In a regular polygon, the line from the center to an outer vertice is a(n)

• Apothem

• Central Angle

• Radius

• Regular Polygon

In a regular polygon the line from the center to the mid-point of an outer side is a(n)

• Radius

• Central Angle

• Sine

• Apothem