Circumference Radius of a Circle

What is the diameter?

• 5 in

• 10 in

• 3.14 in

• 15.84 in

The perimeter around a circle is the ____

• Perimeter

• Radius

• Diameter

• Circumference

The ratio between the circumference and the diameter of a circle is ____

• Congruent

• Diameter

• Pi

• Like term

Half the width of a circle when measured through its center is the ____

• Radius

• Diameter

• Circumference

• Area

Circumference of a Circle Formula when you know the RADIUS

• A = πr²

• C = 2πr

• C = πd

• C = πr

Circumference of a Circle Formula when you know the DIAMETER

• A = πr²

• C = 2πr

• C = πd

• C = πr

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

• Radius

• Diameter

What is the radius?

• 18

• 72

• 38

• 14

What is the radius?

• 70 cm

• 35 cm

• 140 cm

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

• Radius

• Diameter