Grade 7 Unit 3 Glossary

Vocabulary flashcards covering geometry terms, circle properties, and proportional constants from the Grade 7 Unit 3 Glossary.

approximation

A rounded value used to represent a number that may be difficult to work with, such as a never-ending decimal; for example, using $3.14$ for the value of $\text{pi (π)}$.

area

The space inside a two-dimensional figure, expressed in square units.

circle

A shape made out of all the points that are the same distance from a center point.

circumference

The distance around a circle, which can be calculated with the formulas $C = π d$ or $C = 2π r$, where $d$ is the diameter and $r$ is the radius.

constant of proportionality

In a proportional relationship, the number used to multiply the values for one quantity to get the values for the other quantity.

diameter

The distance from one point on a circle through the center to another point on the circle, which is the longest distance across the circle.

pi (π)

A number representing the constant of proportionality between the diameter and circumference of any circle, commonly approximated as $3.14$ or $\frac{22}{7}$.

radius

A line segment that connects the center of a circle with a point on the circle; every radius of a circle is the same length.

scale

A value that tells how the actual measurements of an object are represented in a drawing, such as $1\,\text{inch}$ on a drawing representing $8\,\text{feet}$ in an actual room.