circumference

Find the circumference of the circle.

• 18.8 cm

• 113 cm

• 37.7 cm

• 452.2 cm

Answer explanation

To find the circumference of a circle, use the formula C = 2πr. Given the correct answer is 37.7 cm, this suggests a radius that fits this calculation, confirming it as the right choice among the options.

Find the circumference of the circle.

• 38.47 cm

• 10.99 cm

• 43.96 cm

• 21.98 cm

Answer explanation

To find the circumference of a circle, use the formula C = 2πr. If the radius is approximately 3.5 cm, then C = 2 × π × 3.5 ≈ 21.98 cm, making 21.98 cm the correct answer.

Determine the radius of the penny

• 59.66 mm

• 9.5 mm

• 38 mm

• 119.32 mm

Answer explanation

The radius of a penny is 9.5 mm, which is a standard measurement. The other options are incorrect as they do not match the known dimensions of a penny.

The diameter of a truck wheel is 56.5 inches. What is the circumference of the wheel?

• 177.49 inches

• 167.41 inches

• 157.41 inches

• 187.41 inches

Answer explanation

To find the circumference of a wheel, use the formula C = πd. Here, d = 56.5 inches. Thus, C = π × 56.5 ≈ 177.49 inches. Therefore, the correct answer is 177.49 inches.

What is the diameter?

• 5 in

• 10 in

• 3.14 in

• 15.84 in

Answer explanation

The diameter is the distance across a circle through its center. Among the choices, 10 in is the only option that represents a valid diameter, as it is a standard measurement for circular objects.

What is the circumference?

• 48

• 96

• 24

• 18

Answer explanation

The circumference of a circle is calculated using the formula C = 2πr. If the diameter is 48, then the circumference is 48. Thus, the correct answer is 48.

The perimeter around a circle is the ____

• Perimeter

• Radius

• Diameter

• Circumference

Answer explanation

The perimeter around a circle is called the circumference. It is the total distance around the circle, while the radius and diameter are measurements related to the circle's size, not its perimeter.

The ratio between the circumference and the diameter of a circle is ____

• Congruent

• Diameter

• Pi

• Like term

Answer explanation

The ratio between the circumference (C) and the diameter (D) of a circle is a constant value known as Pi (π), which is approximately 3.14. Therefore, the correct answer is Pi.

The width of a circle when measured through its center is the ____

• Radius

• Diameter

• Circumference

• Area

Answer explanation

The width of a circle measured through its center is called the diameter. The diameter is twice the length of the radius, which is the distance from the center to the edge of the circle.

The width of a circle when measured through its center is the ____

• Radius

• Diameter

• Circumference

• Area

Answer explanation

The width of a circle measured through its center is called the diameter. It is twice the length of the radius, which is the distance from the center to the edge of the circle.