Exploring the Area of a Circle

What is the formula for the area of a circle?

• Area = pi * r^2

• Area = 2 * r^2

• Area = 2 * pi * r

• Area = pi * r

If the radius of a circle is 4 cm, what is the area using 3.14 for pi?

• 12.56 square cm

• 50.24 square cm

• 25.12 square cm

• 100.48 square cm

Why is the area formula represented as pi * r^2 geometrically accurate?

• It is the sum of the circle's radius.

• It represents the number of squares inside the circle.

• It calculates the perimeter of the circle.

• It represents the diameter squared.

What is the area of a circle with a radius of 5 cm using 3.14 for pi?

• 78.5 square cm

• 39.25 square cm

• 157 square cm

• 19.625 square cm

If the diameter of a circle is 12 cm, what is the correct radius to use in the area formula?

• 3 cm

• 12 cm

• 24 cm

• 6 cm

What does it mean to calculate the area of a circle in terms of Pi?

• Using a numerical value for pi

• Leaving pi as a symbolic constant

• Multiplying pi by 2

• Dividing the area by pi

Which representation of the area is more precise: '50.24 cm^2' or '16 Pi cm^2'?

• Both are equally precise

• 16 Pi cm^2

• 50.24 cm^2

• Neither are precise

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

• 81 pi cm^2

• 36 pi cm^2

• 18 pi cm^2

• 72 pi cm^2

For a circle with a diameter of 24 cm, what is the area in terms of Pi?

• 72 pi cm^2

• 12 pi cm^2

• 288 pi cm^2

• 144 pi cm^2

How do you calculate the area of a circle using the radius and Pi?

• Multiply the diameter by Pi

• Divide the circumference by the radius

• Add Pi to the radius squared

• Square the radius and multiply by Pi