Q1: The area of a circle of radius r is:

Q2: If diameter of circle is 14 cm, area is:

Q3: Circumference of circle of radius 7 cm:

Q4: Area of semicircle with radius 14 cm:

Q5: Perimeter of semicircle of diameter 14 cm:

Q6: Area of ring with outer radius 7 cm and inner radius 3 cm:

Q7: Length of arc of sector radius 7 cm and angle 90°:

Q8: Area of sector of circle radius 14 cm and angle 90°:

Q9: If area of circle is 154 cm², radius is:

Q10: Perimeter of quadrant of circle radius 7 cm:

Q11: Area of quadrant of circle radius 14 cm:

Q12: The shaded area between two concentric circles is called:

Q13: If circumference is 44 cm, radius is:

Q14: Area of circle with circumference 44 cm:

Q15: If diameter=28 cm, area of semicircle:

Q16: Length of arc subtending 60° in circle radius 21 cm:

Q17: Area of sector with angle 60° and radius 21 cm:

Q18: If radius doubles, area of circle:

Q19: If radius is halved, area becomes:

Q20: Area of largest circle inside square of side 14 cm:

Q21: Circumference of largest circle inside square side 14 cm:

Q22: If radius=7 cm, perimeter of semicircle:

Q23: Area of sector with angle 180° and radius 7 cm:

Q24: Area of ring with outer diameter 14 cm and inner diameter 10 cm:

Q25: Length of arc subtending 120° at center with r=14 cm:

Q26: Area of sector with angle 120° and radius 14 cm:

Q27: If area=154 cm², circumference=?

Q28: Ratio of areas of circles with radii 3 cm and 6 cm:

Q29: Area of sector with angle 30° and radius 14 cm:

Q30: Circumference of circle radius 3.5 cm: