1. The region enclosed by a circle is called:
A. Circumference
B. Arc
C. Area of Circle
D. Chord

2. The formula for the area of a circle is:
A. πr
B. 2πr
C. πr²
D. r²

3. The formula for the circumference of a circle is:
A. πr²
B. 2πr
C. πd²
D. r²

4. If the radius of a circle is 7 cm, its diameter is:
A. 7 cm
B. 14 cm
C. 21 cm
D. 28 cm

5. The value of π is approximately:
A. 2.14
B. 3.14
C. 4.14
D. 5.14

6. A sector is:
A. A complete circle
B. A region enclosed by two radii and an arc
C. A chord
D. A tangent

7. A semicircle is:
A. One-fourth of a circle
B. Half of a circle
C. Full circle
D. Double circle

8. The angle subtended by a semicircle at the center is:
A. 90°
B. 180°
C. 270°
D. 360°

9. The angle subtended by a quadrant at the center is:
A. 45°
B. 90°
C. 180°
D. 360°

10. A quadrant is:
A. Half circle
B. One-third circle
C. One-fourth circle
D. Full circle

11. The area of a semicircle is:
A. πr²
B. 2πr²
C. ½πr²
D. ¼πr²

12. The area of a quadrant is:
A. ½πr²
B. ¼πr²
C. πr²
D. 2πr²

13. The perimeter of a circle is called:
A. Radius
B. Area
C. Circumference
D. Diameter

14. The length of an arc depends on:
A. Radius only
B. Central angle and radius
C. Diameter only
D. Chord only

15. The formula for arc length is:
A. (θ/360) × 2πr
B. πr²
C. 2πr²
D. θπr²

16. The area of a sector depends on:
A. Radius only
B. Central angle only
C. Radius and central angle
D. Diameter only

17. Formula for area of a sector is:
A. (θ/360)πr²
B. 2πr
C. πr²
D. θπr

18. If θ = 360°, the sector becomes:
A. Semicircle
B. Quadrant
C. Full Circle
D. Arc

19. If θ = 180°, the sector becomes:
A. Semicircle
B. Quadrant
C. Arc
D. Segment

20. If θ = 90°, the sector becomes:
A. Semicircle
B. Quadrant
C. Full Circle
D. Arc