Mastering Circle Measurements and Circumference Calculations

Teacher Bell introduces a lesson on calculating the circumference, radius, and diameter of a circle. The video covers definitions of circle-related terms and demonstrates how to calculate circumference using Pi. It includes exercises for calculating circumference with given diameter or radius, and methods to find diameter and radius from a given circumference. The lesson concludes with a summary and review options.

What is the term for the distance around a circle?

• Radius

• Diameter

• Circumference

• Area

If the radius of a circle is 4 meters, what is the diameter?

• 2 meters

• 4 meters

• 8 meters

• 16 meters

Which formula is used to calculate the circumference when the diameter is known?

• C = 2πr

• C = πd

• C = πr²

• C = 2d

What is the approximate value of Pi used in circumference calculations?

• 5.14

• 4.14

• 2.14

• 3.14

How would you calculate the circumference of a circle with a radius of 12 cm?

• C = 2d

• C = πr²

• C = 2πr

• C = πd

What is the circumference of a circle with a diameter of 20 cm using π = 3.14?

• 125.6 cm

• 31.4 cm

• 94.2 cm

• 62.8 cm

How do you find the diameter if the circumference is 78.5 cm?

• Divide the circumference by 2

• Multiply the circumference by 2

• Divide the circumference by π

• Multiply the circumference by π

What is the diameter of a circle with a circumference of 78.5 cm?

• 35 cm

• 30 cm

• 25 cm

• 20 cm

How do you calculate the radius if the circumference is 94.2 cm?

• Divide the circumference by 2π

• Multiply the circumference by π

• Divide the circumference by π

• Multiply the circumference by 2

What is the radius of a circle with a circumference of 94.2 cm?

• 15 cm

• 12 cm

• 10 cm

• 18 cm