Understanding Circles and Circumference

This video tutorial covers the basics of circles, including their parts such as the center, radius, chord, and diameter. It explains how to calculate the circumference using different formulas and provides examples of solving problems related to circle measurements. The tutorial also includes advanced calculations and reverse engineering to find diameters and radii from given circumferences.

What is the term used for the middle point of a circle?

• Diameter

• Chord

• Center

• Radius

Which of the following statements is true about the radius of a circle?

• It is one-fourth the diameter

• It is half the diameter

• It is twice the diameter

• It is equal to the diameter

What is a chord in a circle?

• A line segment passing through the center

• A line segment equal to the radius

• A line segment connecting two points on the circle

• A line segment connecting the center to the edge

Which of the following is a special type of chord that passes through the center of the circle?

• Circumference

• Diameter

• Radius

• Arc

How do you calculate the circumference of a circle if you know the diameter?

• C = π * d

• C = π * r

• C = 2π * r

• C = d / π

If the radius of a circle is 3 cm, what is the circumference?

• 6π cm

• 9π cm

• 3π cm

• 2π cm

How is a circle named?

• By its radius

• By its circumference

• By its diameter

• By its center

Which of the following is NOT a radius in the given diagram?

• BE

• DA

• CA

• BA

If the diameter of a circle is 16 cm, what is the radius?

• 4 cm

• 32 cm

• 16 cm

• 8 cm

Given the circumference of a circle is 50 cm, what is the approximate diameter?

• 25 cm

• 50 cm

• 31.8 cm

• 15.9 cm