Exploring Circumference and Area of Circles

What will students receive if they choose to do more than what's asked?

• Extra credit

• A gift card

• A special mention

• Nothing extra

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

• 2 * pi * radius

• pi * diameter

• pi * radius squared

• radius * diameter / 2

Which two formulas can be used to calculate the circumference of a circle?

• radius * diameter and pi * radius

• 2 * pi * radius and pi * diameter

• 2 * radius and pi * diameter

• pi * radius squared and 2 * pi * radius

What mistake was corrected during the area calculation example?

• Miscalculation of diameter

• Incorrect squaring of radius

• Wrong value of pi

• Incorrect radius used

What is the correct area of the circle in terms of pi, given the diameter is 19 inches?

• 45.125 pi

• 29.83 pi

• 90.25 pi

• 9.5 pi

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

• radius * diameter

• pi * diameter

• 2 * pi * radius

• pi * radius squared

How many feet of fencing will Brad need for a circular area with a radius of 10 feet?

• 20 feet

• 314 feet

• 62.8 feet

• 31.4 feet

What is half of 80, used to find the radius from the diameter?

• 80

• 160

• 40

• 20

What do you need to calculate first when finding the area of a circle?

• Diameter

• Circumference

• Radius squared

• Pi value

What kind of ghost has the best hearing?

• The eeriest ghost

• The happiest ghost

• The scariest ghost

• The quietest ghost