Q1: 1. What is the formula for the area of a circle?

• A) πr^2
• B) 2πr
• C) πr
• D) 0.5πr

Q2: 2. The circumference of a circle is

• A) 2πr
• B) πr^2
• C) 0.5πr
• D) πr

Q3: 3. A sector of a circle is what fraction of the entire circle?

• A) 1/4
• B) 1/2
• C) 3/4
• D) 1/3

Q4: 4. The area of a sector of a circle with central angle θ is what fraction of the entire circle's area?

• A) θ/360
• B) 360/θ
• C) 2θ
• D) 180/θ

Q5: 5. The length of an arc of a circle is proportional to

• A) The radius of the circle
• B) The central angle of the arc
• C) The diameter of the circle
• D) The circumference of the circle

Q6: 6. Which of the following is NOT related to the area of a circle?

• A) Radius
• B) Diameter
• C) Circumference
• D) Pi (π)

Q7: 7. If the diameter of a circle is doubled, what happens to the area of the circle?

• A) Increases by a factor of 2
• B) Increases by a factor of 4
• C) Increases by a factor of 8
• D) Stays the same

Q8: 8. The area of a circle is maximum when

• A) Radius is minimum
• B) Radius is maximum
• C) Circumference is minimum
• D) Circumference is maximum

Q9: 9. What is the area of a circle with a radius of 12 cm?

• A) 36π cm²
• B) 144π cm²
• C) 72π cm²
• D) 24π cm²

Q10: 10. If the radius of a circle is 5 units, what is the circumference of the circle?

• A) 10π units
• B) 15π units
• C) 25π units
• D) 5π units

Q11: 11. The area of a circle is 154 square units. What is the radius of the circle?

• A) 7 units
• B) 14 units
• C) 11 units
• D) 22 units

Q12: 12. The area of a circle is half the area of a square whose side is 7 cm. What is the radius of the circle?

• A) 3.5 cm
• B) 7 cm
• C) 14 cm
• D) 21 cm

Q13: 13. If the radius of a circle is tripled, how does the area change?

• A) Increases by a factor of 3
• B) Increases by a factor of 6
• C) Increases by a factor of 9
• D) Decreases by a factor of 3

Q14: 14. The area of a circle is 100π square units. What is the circumference of the circle?

• A) 20π units
• B) 10π units
• C) 5π units
• D) 40π units

Q15: 15. If the circumference of a circle is 18π units, what is the area of the circle?

• A) 81π square units
• B) 36π square units
• C) 9π square units
• D) 27π square units

Q16: 16. A circular fountain has a radius of 4 meters. What is the area of the fountain?

• A) 16π square meters
• B) 8π square meters
• C) 32π square meters
• D) 4π square meters

Q17: 17. The area of a circle is 49π square units. What is the radius of the circle?

• A) 7 units
• B) 14 units
• C) 21 units
• D) 28 units

Q18: 18. If a circular clock face has a radius of 5 cm, what is the length of the minute hand?

• A) 5 cm
• B) 10 cm
• C) 15 cm
• D) 20 cm

Q19: 19. The area of a circle is 36π square units. What is the diameter of the circle?

• A) 6 units
• B) 12 units
• C) 18 units
• D) 24 units

Q20: 20. If the circumference of a circle is 24π units, what is the radius of the circle?

• A) 4 units
• B) 6 units
• C) 8 units
• D) 12 units

Q21: 21. The area of a circle is 25π square units. What is the circumference of the circle?

• A) 10π units
• B) 15π units
• C) 20π units
• D) 25π units

Q22: 22. If the radius of a circle is 3 units, what is the area of the circle?

• A) 9π square units
• B) 6π square units
• C) 12π square units
• D) 18π square units

Q23: 23. The area of a circle is 121π square units. What is the radius of the circle?

• A) 11 units
• B) 22 units
• C) 33 units
• D) 44 units

Q24: 24. If the diameter of a circle is 14 units, what is the circumference of the circle?

• A) 7π units
• B) 14π units
• C) 21π units
• D) 28π units

Q25: 25. The area of a circle is 196π square units. What is the circumference of the circle?

• A) 14π units
• B) 28π units
• C) 42π units
• D) 56π units