Radius and Diameter

Front

What is the definition of a radius?

Back

The radius is the distance from the center of a circle to any point on its circumference.

Front

What is the definition of a diameter?

Back

The diameter is the distance across a circle through its center, equal to twice the radius.

Front

If the radius of a circle is 4 inches, what is the diameter?

Back

8 inches (Diameter = 2 x Radius).

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

If a circle has a diameter of 10 inches, what is the radius?

Back

5 inches (Radius = Diameter / 2).

Front

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

Back

Circumference = π x Diameter.

Front

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

Back

Circumference = 2 x π x Radius.

Front

What is the formula for the area of a circle?

Back

Area = π x Radius².

Front

If a pizza has a radius of 8 inches, what is its area?

Back

Approximately 201.06 square inches (Area = π x 8²).

Front

What is the term for a line segment that connects two points on a circle?

Back

Chord.