Parts of a Circle

Front

What is a radius of a circle?

Back

A radius is a straight line from the center of the circle to any point on its circumference.

Front

What is a diameter of a circle?

Back

A diameter is a straight line that passes through the center of the circle and connects two points on its circumference.

Front

How do you calculate the diameter if the radius is known?

Back

Diameter = 2 x Radius.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

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?

Back

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

Front

What is the center of a circle?

Back

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

Front

What is a chord in a circle?

Back

A chord is a straight line segment whose endpoints lie on the circumference of the circle.

Front

What is the longest chord in a circle?

Back

The longest chord in a circle is the diameter.

Front

If the diameter of a circle is 16 cm, what is the radius?

Back

Radius = Diameter / 2 = 16 cm / 2 = 8 cm.