Understanding Circle Measurements

The video tutorial reteaches how to find the radius, diameter, circumference, and area of a circle using mnemonic devices. It explains the concepts of diameter and radius, and demonstrates how to calculate the circumference and area using the approximation of pi (3.14). The tutorial uses practical examples and a calculator to guide viewers through the calculations, emphasizing the use of mnemonics like 'cherry pie is delicious' for circumference and 'apple pies r2' for area.

What does the mnemonic 'Cherry Pie is Delicious' help you remember?

• The formula for radius

• The formula for circumference

• The formula for diameter

• The formula for area

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

• 20

• 15

• 10

• 5

How do you calculate the circumference of a circle?

• Pi times diameter

• Radius squared times pi

• Pi times radius

• Diameter divided by pi

What is the approximate value of pi used in calculations?

• 3.75

• 3.50

• 3.14

• 3.00

If the diameter is 6, what is the circumference using pi as 3.14?

• 9.42

• 15.70

• 18.84

• 12.56

What formula is used to calculate the area of a circle?

• Pi times diameter

• Radius times diameter

• Pi times radius squared

• Diameter squared times pi

If the radius is 3, what is the area using pi as 3.14?

• 37.68

• 18.84

• 28.26

• 9.42

What is the unit of measurement for area?

• Meters

• Square centimeters

• Centimeters

• Square meters

What is the result of squaring the radius of 2.5?

• 5.0

• 7.5

• 10.0

• 6.25

What is the final step in calculating the area of a circle?

• Divide the circumference by pi

• Multiply pi by the squared radius

• Multiply diameter by pi

• Square the diameter