M3L18 Area and Circumference of Circles and Partial Circles

What is the formula for the circumference of a circle?

• C = @@ ext{π} imes d@@

• C = @@2 ext{π} imes r@@

• C = @@ ext{π} imes r^2@@

• C = @@rac{d}{2} imes ext{π}@@

What is the perimeter of a semicircular flower bed with a diameter of 5m?

• 10.00m

• 12.85m

• 15.70m

• 8.00m

What is the diameter of a circle with a radius of 3m?

• 4m

• 5m

• 6m

• 7m

If the diameter of a circle is 10m, what is the radius?

• 5m

• 7m

• 10m

• 2.5m

What is the formula for the area of a partial circle (sector)?

• A = @@\frac{\theta}{360} \times \text{π} \times r^2@@

• A = \text{π} \times r^2

• A = \frac{1}{2} \times r^2 \times \theta

• A = \text{π} \times r \times \theta

If a circle has a circumference of 31.4m, what is its diameter?

• 8m

• 9m

• 10m

• 12m

What is the difference between the area and circumference of a circle?

• The area measures the space inside the circle, while the circumference measures the distance around the circle.

• The area is the distance around the circle, while the circumference measures the space inside the circle.

• The area and circumference are the same measurement of a circle.

• The area measures the diameter of the circle, while the circumference measures the radius.

What is the area of a circle with a radius of 2m?

• 8.00m²

• 12.56m²

• 15.70m²

• 10.00m²

What is the formula for the area of a circle?

• A = @@ ext{π} imes r^2@@

• A = @@2 ext{π}r@@

• A = @@ ext{π}d@@

• A = @@rac{1}{2} ext{π}r^2@@

How do you calculate the area of a semicircle?

• A = @@\frac{1}{2} \times \text{π} \times r^2@@

• A = \text{π} \times r^2

• A = \frac{1}{2} \times r^2

• A = \text{π} \times r