Find the area of the triangle below

3/24 with review 7.4 and 7.5 on 3/25

•7.5 Areas of Regular Polygons

Learning Target

• I can find the area of a regular polygon

• What is a regular polygon, again?

• The center of a regular polygon is the center of a circle circumscribed about the polygon. The radius is the distance from the center to the vertex

• Apothem: the perpendicular distance from the center to a side

• Finding Angle Measures of Regular Polygons

• Do 4-6

• Do 1-3

Area of a regular polygon

• A = ½ apWhere a is the apothem and p is the perimeter of the polygon

• Do 10-12

• Show 7, try 8 and 9

• RECAP– Can you find missing angle measures of a regular

polygon?– Can you use properties of 30-60-90 and 45-45-90

triangles to find a missing apothem or radius?– Can you find the area of a regular polygon using

an apothem and side length?

• Find the area of a regular pentagon with the given apothem and side length

Review 7.4

• Review p.376 1-19

Review 7.5

• Review p. 383 # 1-13