Calculating Area Lecture Notes

Flashcards covering key area formulas for rectangles, triangles, circles, cylinders, and spheres, including specific unit conversions used in water utility calculations.

Area

A way of describing a two dimensional object.

Acre Conversion

$$1\,\text{Acre} = 43,560\,\text{square feet}$$

Rectangle Area Formula

$$A = L \times W$$

Triangle Area Formula

$$A = \frac{1}{2} \times B \times H$$

Circle Area Formula (Radius)

$A = \pi \times r^2$ (where $\pi = 3.14$)

Circle Area Formula (Diameter)

$$A = 0.785 \times D^2$$

Cylinder Circumference Formula

$$C = \pi \times D$$

Cylinder Side Wall Surface Area Formula

$$A = \pi \times D \times H$$

Sphere Surface Area Formula

$$A = \pi \times D^2$$