Calculating the Area of a Circle

What is the formula for the area of a circle?

• Area = r^2 / pi

• Area = pi * r^2

• Area = 2 * pi * r

• Area = pi * d

What does the 'r' in the area formula represent?

• Area of the circle

• Circumference of the circle

• Diameter of the circle

• Radius of the circle

What value of pi is used for calculations in the video?

• 3.14

• 3.142

• 3.14159

• 22/7

How do you square a number?

• Multiply the number by 2

• Divide the number by itself

• Multiply the number by itself

• Add the number to itself

What is the area of a circle with a radius of 9 cm in terms of pi?

• 9 pi square centimeters

• 18 pi square centimeters

• 81 pi square centimeters

• 27 pi square centimeters

What is the approximate area of a circle with a radius of 9 cm?

• 254.34 square centimeters

• 78.5 square centimeters

• 81 pi square centimeters

• 28.26 square centimeters

What does the diameter of a circle represent?

• The distance around the circle

• The distance across the circle through the center

• Half the distance across the circle

• Twice the radius of the circle

How do you find the radius from the diameter?

• Square the diameter

• Divide the diameter by 2

• Square root of the diameter

• Multiply the diameter by 2

What is the area of a circle with a diameter of 12 feet in terms of pi?

• 36 pi square feet

• 12 pi square feet

• 6 pi square feet

• 144 pi square feet

What is the approximate area of a circle with a diameter of 12 feet?

• 72.36 square feet

• 36 pi square feet

• 226.08 square feet

• 113.04 square feet