Radius and Diameter

What is diameter?

• a straight line going from the center point of a circle to the outer edge

• a straight line going from the outer edge of a circle to the other outer edge

• a curved line that goes complete around the outside of a circle

• the area inside a circle

Find the radius of a circle who's diameter is 40 ft.

• 40ft

• 80ft

• 20ft

• 45ft

What is the diameter of this circle?

• 3.5

• 3

• 5

• 7

A circle has a diameter of 156 inches. What is the radius?

• 78

• 312

• 156

• 90

What is the diameter of the circle?

• 16 in

• 32 in

• 8 in

• 4 in

What is the radius of the circle?

• 16 in

• 32 in

• 8 in

• 4 in

What is the radius of the circle?

• 10 km

• 5 km

• 20 km

• 2.5 km

Is this a radius or diameter?

• Radius

• Diameter

What is the radius of the circle?

• 2 yd

• 4 yd

• 8 yd

• 16 yd

Is this a radius or diameter?

• Radius

• Diameter