Circle Properties

What is the formula to calculate the circumference of a circle?

• 2 * π * diameter

• 2 * π * radius

• 2 * π * circumference

• π * radius^2

Define the term 'radius' of a circle.

• The radius of a circle is the length of the circumference

• The radius of a circle is the diameter divided by 2

• The radius of a circle is the area enclosed by the circumference

• The radius of a circle is the distance from the center of the circle to any point on its circumference.

Explain what is meant by the diameter of a circle.

• The diameter of a circle is the angle formed by two radii.

• The diameter of a circle is the distance from the center to any point on the circumference.

• The diameter of a circle is a straight line passing through the center of the circle and connecting two points on the circle's circumference.

• The diameter of a circle is the perimeter of the circle.

If the radius of a circle is 5 cm, what is its circumference?

• 20 cm

• 7.5 cm

• 31.4159 cm

• 15.70795 cm

What is the relationship between the radius and diameter of a circle?

• The diameter is equal to two times the radius.

• The radius is equal to half the diameter.

• The radius is equal to three times the diameter.

• The radius is equal to the diameter squared.

State the formula to find the area of a circle.

• A = 2πr

• A = 0.5πr^2

• A = πr^2

• A = 3r^2

If the diameter of a circle is 12 cm, what is its radius?

• 4 cm

• 6 cm

• 8 cm

• 10 cm

What is the relationship between the circumference and diameter of a circle?

• Circumference = 2 x Diameter

• Circumference = π x Diameter

• Circumference = Diameter^2

• Circumference = Diameter + π

How is the area of a circle affected if the radius is doubled?

• The area of the circle remains the same.

• The area of the circle is tripled.

• The area of the circle is quadrupled.

• The area of the circle is halved.

Explain the concept of a chord in a circle.

• A chord in a circle is a musical note played on a guitar.

• A chord in a circle is a line segment that connects two points on the circle.

• A chord in a circle is a term used in computer programming to describe a data structure.

• A chord in a circle is a type of geometric shape with four sides.