Circumference and Area of a Circle

What is the circumference of a circle with a radius of 4.5 m?

• 24.56 m

• 28.27 m

• 31.42 m

• 20.13 m

What is the circumference of a circle with a radius of 6 yd?

• 30.00 yd

• 31.42 yd

• 37.70 yd

• 40.00 yd

What is the formula for the circumference of a circle?

• C = πd

• C = 2πr

• C = r^2

• C = 2r

What is the circumference of a circle with a diameter of 8 m?

• 20.00 m

• 25.13 m

• 30.00 m

• 18.85 m

How do you find the area of a circle if you know the circumference?

• Use the formula A = πr² directly.

• First, find the radius using the circumference formula C = 2πr, then use A = πr² to find the area.

• Calculate the diameter and then use A = πd².

• Multiply the circumference by π to get the area.

If a circle has an area of 50.24 m², what is its radius?

• 2 m

• 3 m

• 4 m

• 5 m

If the radius of a circle is 5 m, what is its circumference?

• 25.00 m

• 31.42 m

• 15.70 m

• 10.00 m

What units are used to measure the area of a circle?

• square meters (m²)

• cubic meters (m³)

• linear meters (m)

• square feet (ft²)

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

• The diameter is equal to the radius.

• The diameter is half of the radius.

• The diameter (d) of a circle is twice the radius (r), so d = 2r.

• The diameter and radius are unrelated.

What is the formula for the area of a circle?

• A = 2πr

• A = πr²

• A = πd

• A = r²π