Area & Circumference of Circles

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

• Radius
• Diameter

What is the radius of this circle?

• 18in
• 36in
• 9in
• 8in

A ball has a circumference of 9.42 cm. What is the diameter?

• 29.5788 cm
• 59.1576 cm
• 3 cm
• 1.5 cm

Steven purchases a bowl. The diameter of the bowl is 14 cm.
What is the distance around the bowl?

• 21.98 cm
• 43.98 cm
• 87.96 cm
• 7 cm

What is the diameter?

• 8cm
• 16cm
• 10cm
• 4cm

A cruise ship has a large, circular window. It has a diameter of 6 meters. How many square meters of glass is the window made of?

• 31.25 m²

• 29.55 m²

• 30.36 m²

• 28.27 m²

Find the radius of a circle if the area is 201.1 mi²

• 10 mi
• 8mi
• 20 mi
• 5mi

If you are going to paint the entire center circle of a basketball court, do you need to know the area or circumference of the circle?

• Area
• Circumference
• Neither

The radius of a circle is 6.5 inches.

Find the circumference of the circle.

• 132.7 in

• 40.8 in

• 20.4 in

• 572.3 in

What is the area of this circle?

• 50.27 cm²

• 78.23 cm²

• 98.12 cm²

• 201.06 cm²