Exploring Circumference and Area of a Circle

The video tutorial reviews key circle concepts such as circumference, diameter, and radius. It explains formulas for calculating the circumference and area of a circle, emphasizing the use of pi in these calculations. The tutorial discusses the exact and approximate values of pi and provides example problems to demonstrate how to calculate the circumference and area using both exact and approximate values.

What term describes the distance around a circle?

• Radius

• Diameter

• Circumference

• Area

How is the diameter related to the radius?

• Diameter is Pi times the radius

• Diameter is equal to the radius

• Diameter is twice the radius

• Diameter is half the radius

What is the radius if the diameter is 8 cm?

• 4 cm

• 8 cm

• 2 cm

• 16 cm

If the diameter of a circle is 12 cm, what is the radius?

• 3 cm

• 12 cm

• 24 cm

• 6 cm

If the diameter of a circle is 10 cm, what is the circumference using Pi as 3.14?

• 31.4 cm

• 62.8 cm

• 15.7 cm

• 20 cm

Using Pi as 3.14, what is the approximate circumference of a circle with a radius of 5 cm?

• 15.7 cm

• 10 cm

• 31.4 cm

• 62.8 cm

What is the formula for the area of a circle?

• 2 * Pi * radius

• Pi * radius squared

• Pi * diameter

• Pi * radius

What is the value of Pi to the nearest hundredth?

• 3.14

• 3.14159

• 3.1

• 3

What is the exact area of a circle with a radius of 3 cm using Pi symbolically?

• 6 Pi cm^2

• 18 Pi cm^2

• 3 Pi cm^2

• 9 Pi cm^2

What is the approximate area of a circle with a radius of 6 cm using Pi as 3.14?

• 18.84 cm^2

• 226.08 cm^2

• 36 cm^2

• 113.04 cm^2