MEASURING CIRCLES TEST REVIEW

What is the circumference of a circle with a diameter of 12 cm?

• 12 cm

• 24 cm

• 37.68 cm

• 75.36 cm

If the radius of a circle is 5 inches, what is its area in terms of π?

• 15π square inches

• 20π square inches

• 25π square inches

• 30π square inches

What is the formula for the circumference of a circle?

• C = πd

• C = 2πr

• C = πr^2

• C = 2r

What is the area of a circle with a radius of 4 cm in terms of π?

• 12π square cm

• 16π square cm

• 20π square cm

• 8π square cm

What is the relationship between diameter and circumference?

• The circumference of a circle is directly proportional to its diameter, expressed as C = πd, where d is the diameter.

• The circumference is equal to the diameter multiplied by 2.

• The diameter is equal to the circumference divided by π.

• The circumference is independent of the diameter.

What is the formula for the area of a circle?

• A = πr²

• A = 2πr

• A = πd

• A = r²

If the radius of a circle is doubled, how does the area change?

• The area remains the same.

• The area increases by a factor of two.

• The area increases by a factor of four.

• The area decreases by a factor of four.

What is the circumference of a circle with a radius of 4 cm?

• 12.56 cm

• 25.12 cm

• 18.84 cm

• 31.42 cm

What is π (pi)?

• A mathematical constant approximately equal to 3.14, representing the ratio of a circle's circumference to its diameter.

• A type of fruit commonly found in pies.

• A unit of measurement for angles.

• A famous mathematician known for his work in geometry.

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

• 3 cm

• 4 cm

• 5 cm

• 6 cm