Calculating the Area of a Circle from Radius or Diameter

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

• Area = PI * radius

• Area = PI * radius squared

• Area = PI * diameter squared / 4

• Area = diameter / radius

If the diameter of a circle is 6, what is the radius?

• 9

• 6

• 3

• 12

What is the relationship between the diameter and radius of a circle?

• Diameter is half the radius

• Radius is twice the diameter

• There is no fixed relationship

• Diameter is twice the radius

How do you calculate the area of a circle using its diameter?

• Area = PI * diameter squared / 4

• Area = PI * radius squared

• Area = PI * diameter

• Area = diameter squared

What is the result of squaring the radius 3?

• 3

• 12

• 9

• 6

What mathematical operation is performed first when calculating the area using the radius?

• Addition

• Subtraction

• Multiplication

• Exponentiation

What is the result of 6 squared divided by 4?

• 9

• 12

• 18

• 36

What is the final step in calculating the area using the diameter?

• Square the diameter

• Add the diameter

• Divide by 4

• Multiply by PI

Which of the following is a correct representation of the area of a circle?

• PI plus 9

• 9 plus PI

• PI times 9

• 9 times PI

Why is it conventional to write the area as '9 times PI' instead of 'PI times 9'?

• There is no difference; it's just a preference

• It simplifies the calculation

• It is easier to read

• It is a mathematical rule