Partial Circle Area and Circumference

What two formulas can you use to find the circumference?

• C = π·d

• C = 2·π·r

Answer explanation

The two formulas to find the circumference are C = π·d and C = 2·π·r.

Find the circumference of the circle.

• 31.4 cm

• 78.5 cm

• 314 cm

• 15.7 cm

Answer explanation

The circumference of a circle is calculated using the formula 2 * π * radius. Given the radius is 5 cm, the circumference is 2 * 3.14 * 5 = 31.4 cm. Therefore, the correct answer is 31.4 cm.

The distance from the center of a circle to any point on the circle

• radius

• diameter

• circumference

• arc

Answer explanation

The distance from the center of a circle to any point on the circle is called the radius, making it the correct choice among the options provided.

The _______ of a circle is the distance around the circle.

• radius

• diameter

• circumference

Answer explanation

The correct term for the distance around a circle is the circumference.

What number represents π?

• 31.4

• 4.13

• 3.14

• 34.1

Answer explanation

The number that represents π is 3.14, which is the correct answer choice provided.

Find the circumference of the circle.

• 14.13 cm

• 63.56 cm

• 28.26 cm

• 127.17 cm

Answer explanation

The circumference of a circle is calculated using the formula 2 * π * radius. Given the radius is 4.5 cm, the circumference is 2 * 3.14 * 4.5 = 28.26 cm. Therefore, the correct answer is 28.26 cm.

Shring's dining room table is round and has a radius of 4.5 feet. What is the tabletop's area?

• 63.585 ft²

• 68.345 ft²

• 64.585 ft²

• 61.345 ft²

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

What is the circumference of this circle?

Which equation would be used to find the circumference of a circle with a radius of 40 feet?