Circles: Radius & Diameter

Front

What is the definition of a radius?

Back

A radius is a line segment that connects the center of a circle to any point on its circumference.

Front

What is the definition of a diameter?

Back

A diameter is a line segment that passes through the center of a circle and connects two points on its circumference. It is twice the length of the radius.

Front

How do you calculate the diameter if you know the radius?

Back

Diameter = 2 x Radius.

Front

How do you calculate the radius if you know the diameter?

Back

Radius = Diameter ÷ 2.

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

What is the symbol for pi?

Back

π (pi) is the symbol used to represent the ratio of the circumference of a circle to its diameter.

Front

What is the approximate value of pi?

Back

The approximate value of pi is 3.14.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

How do you calculate the circumference of a circle using the radius?

Back

Circumference = 2 x π x Radius.

Front

How do you calculate the circumference of a circle using the diameter?

Back

Circumference = π x Diameter.