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Circles

When working with geometry always draw the figure, putting in the measurements. This habit helps when going over the homework without the book or checking for errors.

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Always write the formula

(abbreviations are okay).

Plug in the numbers.

Solve - being sure to add the measurement squared.

Basic Formula is

Area = "pi" x radius x radius

Answer is the measurement squared.

Circumference = "pi" x diameter

Answer is the measurement only.

 

Remember circles and circles only always use "pi" (3.14).

2 x radius = 1 diameter

1/2 diameter = 1 radius

Are you still taking notes?

Remember you can repeat the movies as often as you need to.