Exploring Parts of a Circle and Circumference

What is the primary shape discussed in this unit?

• Square

• Triangle

• Circle

• Rectangle

What term describes a line segment from the center of the circle to any point on the circle?

• Circumference

• Radius

• Chord

• Diameter

What is the term for a line segment whose endpoints are on the circle?

• Arc

• Chord

• Diameter

• Radius

What is the name of the constant approximately equal to 3.14 used in circle calculations?

• Pi

• Golden ratio

• Square root of two

• Euler's number

What is the formula for the circumference of a circle?

• C = Pi * R^2

• C = 2 * Pi * R

• C = Pi * D

• C = R / Pi

If the diameter of a circle is 10 units, what is the radius?

• 10 units

• 5 units

• 15 units

• 20 units

How do you calculate the circumference if you know the radius?

• Divide the diameter by Pi

• Multiply the diameter by Pi

• Multiply the radius by Pi

• Multiply the radius by 2 * Pi

What does the diameter equal in terms of the radius?

• R * 2

• 2 / R

• R / 2

• R + 2

If the radius is 4 units, what is the approximate circumference using Pi ≈ 3.14?

• 50.24 units

• 12.56 units

• 25.12 units

• 6.28 units

How do you find the radius if the circumference is given as 24 units?

• Multiply circumference by Pi

• Divide circumference by 2 * Pi

• Multiply circumference by 2

• Divide circumference by Pi