Parts of a Circle

Front

What is the term for the distance from the center of a circle to any point on its circumference?

Back

Radius

Front

What is the term for the longest distance across a circle, passing through the center?

Back

Diameter

Front

What is the term for the distance around the outside of a circle?

Back

Circumference

Front

What is the center of a circle?

Back

The point that is equidistant from all points on the circumference.

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

10 cm (Diameter = 2 x Radius)

Front

If the diameter of a circle is 12 cm, what is the radius?

Back

6 cm (Radius = Diameter / 2)

Front

What is the formula for calculating the circumference of a circle?

Back

Circumference = π x Diameter or Circumference = 2 x π x Radius

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the length of the radius.

Front

What do you call a line segment that connects two points on the circumference of a circle?

Back

Chord

Front

What is a semicircle?

Back

Half of a circle, formed by cutting a whole circle along a diameter.