Exploring Circles: Radius, Diameter, and Circumference

Mississippi Ron introduces the concepts of circles, focusing on radius, diameter, and circumference. The video explains the definitions and relationships between these terms, using examples to illustrate how to identify and calculate them. The teacher also covers the formulas for circumference, providing step-by-step instructions for solving problems with given radius or diameter values.

What is the term used for the distance from the center of a circle to any point on its edge?

• Diameter

• Area

• Radius

• Circumference

What is the correct plural form of 'radius'?

• Radiuses

• Radiusi

• Radiuses

• Radii

If a circle has a diameter of 18 yards, what is the radius?

• 18 yards

• 9 yards

• 6 yards

• 36 yards

If the radius of a circle is 7.5 meters, what would be the diameter?

• 30 meters

• 15 meters

• 3.75 meters

• 7.5 meters

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

• 10 units

• 5 units

• 20 units

• 2.5 units

Which formula would you use to calculate the circumference if you know the radius?

• C = pi * D

• C = 2 * pi * R

• C = D / pi

• C = R * R * pi

Which formula is appropriate for calculating circumference when the diameter is known?

• C = 2 * pi * R

• C = D * D * pi

• C = R / pi

• C = pi * D

What does the letter 'R' represent in the circumference formula C = 2 * pi * R?

• Rectangle

• Radian

• Radius

• Range

What is the circumference of a circle with a radius of 4.5 meters using pi as 3.14?

• 14.13 meters

• 28.26 meters

• 9 meters

• 18 meters

What is the circumference of a circle with a diameter of 10 units using pi as 3.14?

• 62.8 units

• 31.4 units

• 20 units

• 15.7 units