Diameter and Radius

What shape is this?

• square

• triangle

• rectangle

• circle

The diameter is...

• twice the radius

• half the radius

• 4 times the radius

• the radius squared

The radius is.....

• twice the diameter

• half the diameter

• the diameter squared

The radius is 4. What is the diameter?

• 2

• 6

• 8

The diameter is 6. What is the radius?

• 12

• 3

• 36

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

• Radius

• Diameter

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

• Radius

• Diameter

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

• Radius

• Diameter

Find the diameter!

• 18 km

• 4.5 m

• 18 m

• 27 m

What is the circle's radius?

• 6 ft

• 12 ft

• 24 ft