Circumference and Diameter of Circles

This video tutorial explains how to calculate the circumference of a circle using two formulas: one involving the diameter and the other involving the radius. It demonstrates how to choose the appropriate formula based on the given information, such as diameter or radius, and how to solve for unknowns like radius or diameter when the circumference is provided. The tutorial includes step-by-step calculations and examples to ensure understanding.

What is the formula for calculating the circumference of a circle when the diameter is known?

• C = 2 * π * R

• C = π * D

• C = π * R

• C = 2 * π * D

If the radius of a circle is 1, what is the circumference using π = 3.14?

• 3.14

• 9.42

• 6.28

• 12.56

Which operation is used to isolate the radius when given the circumference?

• Division

• Multiplication

• Subtraction

• Addition

If the circumference of a circle is 7,850, what is the radius using π = 3.14?

• 1,500

• 1,250

• 1,750

• 2,000

What is the formula for calculating the circumference of a circle when the radius is known?

• C = 2 * π * R

• C = π * R

• C = 2 * π * D

• C = π * D

If the diameter of a circle is 3, what is the circumference using π = 3.14?

• 6.28

• 9.42

• 15.70

• 12.56

What is the diameter of a circle if its circumference is 113.04 using π = 3.14?

• 38

• 36

• 34

• 32

Which operation is used to isolate the diameter when given the circumference?

• Division

• Multiplication

• Subtraction

• Addition

If the circumference of a circle is 113.04, what is the diameter using π = 3.14?

• 38

• 36

• 40

• 34

What is the relationship between diameter and radius?

• Diameter is half the radius

• Diameter is twice the radius

• Diameter is equal to the radius

• Diameter is three times the radius