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A diameter is _____ the radius of any circle.

• three times
• half
• two times
• one-third

If the diameter of a circle is 50 yards, the radius is _____

• 100 yards
• 25 yards
• 150 yards
• 15 yards

If the radius of a circle is 12.5 meters, the diameter is ____

• 6.25 meters
• 125 meters
• 25 meters
• 50 meters

If the diameter of a circle is 10 mm, the circumference is approximately ___

• 314 mm
• 3.14 mm
• 31.4 mm
• 20 mm

If the diameter of a circle is 30 feet, what is the approximate circumference of the circle?

• 94.2 feet
• 9.42 feet
• 60 feet
• 15 feet

If the radius of a circle is 18 inches, what is the approximate circumference of the circle?

• 36 inches
• 9 inches
• 11.304 inches
• 113.04 inches

Serena drew a circle with a circumference of 157 centimeters.  What is the approximate diameter of the circle she drew?

• 1.57 cm
• 15.7 cm
• 50 cm
• 25 cm

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

The distance around a circle.

• perimeter
• diameter
• circumference
• radius

Find the measure of the indicated central angle.