Advanced Geometry
Topic 13 – Area
NOTES – Area of Regular Figures (13-3)
Name: _____________________________________________________
Date: _________________________________ Period: ____________
POSTULATE 13-2
AREA FORMULA
Finding Angle Measures
At the right, a portion of a regular octagon has radii and an apothem
drawn. What is the measure of each numbered angle?
Finding the Area of a Regular Polygon
a.
What is the area of a regular pentagon with an 8-cm apothem and 11.6-cm sides?
b.
If the side of a regular polygon is reduced to half its length, how does the perimeter of the polygon
change? Explain.
Using Special Triangles to Find Area
The side of a regular hexagon is 16 ft. What is the area of the hexagon?
Round your answer to the nearest square foot.
Finding the Area of a Composite Figure
A rhombus has sides 10 cm long. If the longer diagonal is 16 cm, what is the area of the rhombus?
Finding the Area of a Composite Figure
FROM THE TEXTBOOK:
The figure below is composed of two congruent regular hexagons and
two triangles. What is the area of the figure? Round your answer to the
nearest square meter.
TRY THESE…
ANSWERS: 1. B, 2. J, 3. B, 4. J