Area, Circumference, Diameter of a Circle

What is the relationship between the diameter and radius of a circle?

• Diameter is equal to the radius

• Diameter is half of the radius

• Diameter is twice the radius

• Diameter is three times the radius

The picture shows 3 equal circles touching each other. QV = 7.3 cm. Calculate the perimeter of the triangle QUS. It measurement, in cm, will be:

• 43.3

• 44.1

• 43.5

• 43.8

The diameter of circle L is 20 units and the diameter of circle M is 13 units and QR = 4. Find LQ.

• 16 units

• 6 units

• 14 units

• 9 units

A tire has a radius of 14 inches. What is its diameter?

• 14 inches

• 7 inches

• 28 inches

A pond has a diameter of 12 feet. What is its radius?

• 12 feet

• 6 feet

• 24 feet

Determine the radius of the penny

• 59.66 mm

• 9.5 mm

• 38 mm

• 119.32 mm

What is the formula for finding the area of a circle?

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The image shows two circles. The diameter of Circle A measures 5 cm, and it is the same as the radius of Circle B. What is the diameter of Circle B?

• 5 cm

• 25 cm

• 10 cm

• 12.5 cm

I wrapped a tape measure around the trunk of the tree and it was 14.13 feet. What is the diameter of the tree? Use 3.14 for pi. Round to the nearest hundredth.

• 2.25 ft

• 44.37 ft

• 4.5 ft

• 17.27 ft

The distance across a circle through the center is called what?

• Area

• Diameter

• Circumference

• Radius