Unit 5
Glossary
Accelerated 6
area of a circle
The area of a circle is the number of square units it covers. If a circle has radius
For example, a circle has radius of 3 inches. Its area is
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The coordinate plane is one way to represent pairs of numbers. The plane is made of a horizontal number line and a vertical number line that cross at 0.
Pairs of numbers can be used to describe the location of a point in the coordinate plane.
Point
There is a proportional relationship between the diameter and circumference of any circle. The constant of proportionality is pi. The symbol for pi is
This relationship can be represented with the equation
Some approximations for
In a proportional relationship, the values for one quantity are each multiplied by the same number to get the values for the other quantity.
This table shows a proportional relationship between
| 2 | 8 |
| 3 | 12 |
| 5 | 20 |
| 10 | 40 |