Real World Circles

Amy attaches her A+ test to the refrigerator with a circular magnet. Out of curiosity, she measures the magnet and calculates that it has a radius of 3 cm. What is the magnet’s circumference?

• 9.42 cm

• 188.4 cm

• 18.84 cm

• 28.26 cm

Mike has a round trampoline with a diameter of 2 meters. What is the trampoline’s circumference?

• 6.28 meters

• 3.14 meters

• 7.14 meters

• 62.8 meters

A coffee mug has a diameter of 6 cm. What is the mug’s radius?

• 2 cm

• 12 cm

• 6 cm

• 3 cm

While running for class president, Tara handed out a campaign button. The button has a diameter of 8 cm. What is the button’s radius?

• 16 cm

• 4 cm

• 2 cm

• 8 cm

An architect is making a plan for a new circular playground. If the diameter of the playground is 64 meters, how much fencing needs to go up to keep the kids in the circle?

• 200.96 meters

• 100.48 meters

• 20.096 meters

• 128 meters

A family room has a circular rug. The rug has a diameter of 10 feet. What is the area of the rug?

• 314 feet

• 785 feet

• 15.7 feet

• 78.5 feet

A circular bracelet has a diameter of 6 cm. What is the bracelet’s radius?

• 12 cm

• 36 cm

• 3 cm

• 3.3 cm

Jacob has a round tablecloth with a radius of 1 meter. What is the tablecloth’s area?

• 3.14 meters

• 6.28 meters

• 31.4 meters

• 62.8 meters

After stepping into a room with unusual lighting, Lucy’s pupil has a diameter of 6 millimeters. What is the pupil’s circumference?

• 9.42 mm

• 1.884 mm

• 18.84 mm

• 11.304 mm

A state seal, which is round, hangs in the capitol building. It has a radius of 2 feet. What is the seal’s area?

• 12.56 feet

• 50.24 feet

• 25.12 feet

• 6.28 feet