Basic Geometry Vocab & Formulas

Front

Perimeter definition

Back

Distance around a 2-D shape.

Front

Area: Amount of space inside a 2-D object.

Back

Amount of space inside a 2-D object.

Front

Surface area:

Back

The amount of space covering a 3-D shape.

Front

Volume: Amount of space in a 3-D object.

Back

Amount of space inside a 3-D object.

Front

Find the perimeter:

Back

Add up all sides.

Front

Area of a triangle:

Back

\frac{1}{2} length x height

Front

Area of a rectangle?

Back

length x width

Front

Distance around a circle?

Back

circumference

Front

In a circle, the radius equals...

Back

half of the diameter

Front

Area of a circle:

Back

π × radius²