Section 8.2: Area

8.2 Outline

1. Rectangles
   1. define area
   2. define square unit
   3. formulas
      1. rectangle
      2. square
2. Parallelograms
   1. definition
   2. formula
   3. derivation of formula
3. Triangles
   1. formula
   2. derivation of formula
4. Trapezoids
   1. definition
   2. formula
   3. derivation of formula
5. Circles
   1. formula
   2. derivation of formula
6. Applications
   1. conversion application
   2. acre definition
   3. conversion of acres to square feet

8.2 Essential Ideas

Area  is the number of squares which will fit inside a given figure.

Some common area formula for area are:

rectangle; A = lw
square; A =s²
parallelogram; A=bh
triangle; A= (1/2)bh
trapezoid; A= (1/2)h (b +B)
circle; A= πr²
acre; A = 43,560 ft²