area and circumference

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

• Radius
• Diameter

What is the area of this circle? Use the Pi button.

• 452.39 cm²

• 139.12 cm²

• 113.1 cm²

• 84.23 cm²

What is circumference?

• The distance around a circle.
• The space inside the circle.
• A line from side to side passing through the center.
• A line from the center to the side.

What is the area of a circle?

• The distance around a circle.
• The space inside the circle.
• A line from side to side passing through the center.
• A line from the center to the side.

The radius is....

• a line that crosses through the center and touches each edge 
• the center point of a circle 
• a line from the center point to the edge of the circle
• an element in science

What is the circumference of a circle with a diameter of 19.1 ft? Use 3.14 for Pi.

• 60.00 ft

• 35.17 ft

• 28.67 ft

• 47.17 ft

What is the radius of this circle?

• 18
• 36
• 9
• 6

The circumference of a circle is 188 meters. What is the approximate radius of the circle?

• 128 meters

• 94 meters

• 60 meters

• 30 meters

• 40.8 m

Find the circumference of a circle with an area of 1,809.56 square centimeters.

• 260,577 cm

• 150.8 cm

• 75.4 cm

• 473.8 cm