area and circumference

Is this a radius or diameter?

• Radius

• Diameter

What is the diameter of the circle?

• 2 yd

• 4 yd

• 8 yd

• 16 yd

Is this a radius or diameter?

• Radius

• Diameter

What is the diameter of the circle?

• 10 km

• 5 km

• 20 km

• 2.5 km

What is the radius?

• 94 cm

• 188 cm

• 47 cm

What is the diameter?

• 40 ft

• 80 ft

• 20 ft

a straight line from the center of a circle to the circumference

• Diameter

• Circumference

• Radius

• Area

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