## Key Concepts

**Convert a Fraction to a Decimal**To convert a fraction to a decimal, divide the numerator of the fraction by the denominator of the fraction.**Properties of Circles**

[latex]r[/latex] is the length of the radius

[latex]d[/latex] is the length of the diameter

The circumference is [latex]2\pi r[/latex] , [latex]C=2\pi r[/latex]

The area is [latex]\pi {r}^{2}[/latex] , [latex]A=\pi {r}^{2}[/latex]

## Glossary

- circumference of a circle
- The distance around a circle is called its circumference.

- diameter of a circle
- A diameter of a circle is a line segment that passes through a circle’s center connecting two points on the circle.

- radius of a circle
- A radius of a circle is a line segment from the center to any point on the circle.

- repeating decimal
- A repeating decimal is a decimal in which the last digit or group of digits repeats endlessly.

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