Circle Challenge: Area and Circumference for 7th Graders

A circular garden has a radius of 5 meters. What is the area of the garden?

• 20π square meters

• 30π square meters

• 15π square meters

• 25π square meters

If the same garden has a fence around it, what is the circumference of the garden?

• Circumference is always a fixed value.

• Circumference depends on the shape and dimensions of the garden.

• Circumference can only be calculated for circular gardens.

• The circumference is equal to the area of the garden.

A pizza has a diameter of 12 inches. Calculate the area of the pizza.

• 150 square inches

• 94.2 square inches

• 113.1 square inches

• 78.5 square inches

If you want to put a border around the pizza, how long will the border be (circumference)?

• C = π * r^2

• C = 2 * r

• C = 2 * π * r

• C = π * d

A circular swimming pool has a radius of 10 feet. What is the area of the pool?

• 50π square feet

• 200 square feet

• 100π square feet

• 75π square feet

How much fencing is needed to enclose the swimming pool (circumference)?

• The amount of fencing is always 100 meters regardless of pool size.

• The pool can be enclosed with a single fence panel.

• Fencing is not required for a swimming pool.

• The amount of fencing needed depends on the dimensions of the pool.

A round table has a diameter of 4 feet. What is the area of the table's surface?

• 12.57 square feet

• 15.70 square feet

• 10.24 square feet

• 8.00 square feet

If you want to place a tablecloth around the table, how much fabric is needed for the circumference?

• C = π * (d + 1) (where d is the diameter)

• C = π * d (where d is the diameter of the table)

• C = 4 * d (where d is the diameter)

• C = 2 * π * r (where r is the radius)

A circular track has a radius of 20 meters. Calculate the area of the track.

• 300π square meters

• 500π square meters

• 250 square meters

• 400π square meters

What is the distance around the track (circumference)?

• C = 2 * r

• C = 4 * r

• C = 2 * π * r or C = π * d

• C = r^2 * π