Diameter or Radius

The distance halfway across the circle is called the...

• radius

• diameter

• circumference

• area

The distance from the center of the circle to any point on the circle is called the...

• radius

• diameter

• circumference

• area

The distance across the circle through the center is called the...

• radius

• diameter

• circumference

• area

The distance all the way across the circle is called the...

• radius

• diameter

• circumference

• area

A straight line segment that passes through the center of a circle and whose endpoints lie on the circumference of the circle is called the ____.

• Diameter

• Radius

• Circumference

• Area

A straight line from the center of a circle to the circumference is called the ____.

• Diameter

• Circumference

• Radius

• Area

Find the diameter!

• A. 18 km

• b. 4.5 m

• C. 18 m

• D. 27 m

Radius of this circle is ....

• A. 6 cm

• B. 6 m

• C. 24 cm

• D. 24 m

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

The diameter is...

• twice the radius

• half the radius

• 4 times the radius

• the radius squared