1. Y. Davis Geometry Notes
Chapter 11

2. Postulate 11.1 Area Addition Postulate
The area of a region is the sum of the areas of its non-overlapping parts

3. Area of a Parallelogram
A=bh

4. Postulate 11.2 Area Congruence Postulate
If 2 figures are congruent, then they have the same area.

5. Area of a Triangle
A=½bh

6. Area of a Trapezoid
A=½(b2+b1)h

7. Area of Rhombus or Kite
A=½d1d2

8. Area of Circle
A=πr²

9. Sector of a circle
A region of a circle bounded by a central angle and its intercepted arc.

10. Area of Sectors

11. Center A
Central Angle
Radius
Apothem

12. Central Angle
The measure of a central angle is 360 divided by the number of sides

13. Area of Regular Polygon
A=½aP

14. Composite Figures
A figure that can be separated into regions that are basic figures.

15. Theorem 11.1 Area of similar polygons
If 2 polygons are similar, then their areas are proportional to the square of the scale factor between them.