Area and Circumference of Circles Challenge

If the problem ask you to find the distance around a circle, which formula should you use?

• r = d/2

• d = 2r

• C = πd

• A = πr²

Tags

CCSS.7.G.B.4

Which formula would you use to answer: Lauren's bicycle tire has a diameter of 20 inches. How many inches is one full revolution of the wheel?

Tags

CCSS.7.G.B.4

What is the radius of this circle?

• 18in

• 36in

• 9in

• 6in

Tags

CCSS.7.G.B.4

A circular swimming pool is 21 feet in diameter.

About how many feet around is the pool?

• 11 ft

• 42 ft

• 66 ft

• 132 ft

Tags

CCSS.7.G.B.4

The Jones family wants to enclose their circular garden with a fence. To the nearest foot, what is the minimum length of fencing they need to buy?

• 196 ft

• 246 ft

• 392 ft

• 393 ft

Tags

CCSS.7.G.B.4

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 21.98 ft

• 12.25 ft

• 10.99 ft

• 38.47 ft²

Tags

CCSS.7.G.B.4

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area?

• 113.04 m²

• 18.84 m²

• 9.42 m²

• 28.26 m²

Tags

CCSS.7.G.B.4

Randy’s circular garden has a radius of 1.5 feet. He wants to enclose the garden edging that costs $0.75 per foot. About how much will the edging cost?

• $5.30

• $7.00

• $3.50

• $0.50

Tags

CCSS.7.G.B.4

Mrs. Apple just bought a new dinning room table. She needs to make a table cloth for decoration. What amount of fabric should she buy if the table has a diameter of 5 feet? Choose the equation that would best help solve this problem.

• C = π5

• C = (2)(π)(2.5)

• A = π5²

• A = π2.5²

Tags

CCSS.7.G.B.4

Your Geometry teacher rents a fast car for the weekend. Her friend, a Physics teacher, uses a stopwatch to time how long it takes your teacher to make one complete revolution about the track. Is this question circumference or area?

• Circumference

• Area

Tags

CCSS.7.G.B.4