Understanding Circles: Area and Circumference

What formula is used to find the area of a circle?

• C = πd

• A = πr^2

• D = 2r

• C = 2πr

What does the diameter of a circle represent?

• Half the distance across the circle

• The distance around the circle

• The area of the circle

• The distance across the circle through its center

What does the radius of a circle measure?

• The perimeter of the circle

• The distance across the circle

• The area of the circle

• Half the distance across the circle

How can the area of a circle be described?

• The space inside the circle

• The length around the circle

• The diameter of the circle

• The distance across the circle

How is the circumference of a circle calculated using the diameter?

• C = πd

• C = πr^2

• C = 2πr

• C = d/π

What is the value of π (Pi) used in circle calculations?

• 3.14

• 2.18

• 3.14159

• 3

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

• Circumference equals the square of the diameter

• Circumference is half the diameter

• Circumference is twice the diameter

• Circumference divided by diameter equals π

What does the term 'circumference' refer to?

• The distance around the circle

• Half the distance across the circle

• The distance across the circle

• The area of the circle

If the diameter of a circle is 22 inches, what is its radius?

• 33 inches

• 44 inches

• 11 inches

• 22 inches

If a circle has a radius of 11 inches, what is its area?

• 342.2 square inches

• 44 square inches

• 22 square inches

• 380.13 square inches