Circle Geometry Basics

Front

What is the circumference of a circle?

Back

The distance around a circle.

Front

What is the circumference of a circle with radius 3?

Back

2⋅π⋅3, which is 6π or about 18.85 inches.

Front

What is the relationship between diameter and circumference in a circle?

Back

There is a proportional relationship, with the constant of proportionality being pi (π).

Front

What is the symbol for pi?

Back

π

Front

What is a diameter in a circle?

Back

A line segment that goes from one edge of a circle to the other and passes through the center. It can go in any direction and every diameter of the circle is the same length.

Front

What does the word 'diameter' also refer to?

Back

The length of the line segment that goes from one edge of a circle to the other and passes through the center.