Question : A 15 cm long perpendicular is drawn from the centre of a circle to its 40 cm long chord. Find the radius of the circle.

Option 1: 25 cm

Option 2: 27 cm

Option 3: 22 cm

Option 4: 20 cm

Question : If the length of a chord drawn at a distance of 21 cm from the centre of a circle is 40 cm, the radius (in cm) of the circle is:

Option 1: 29

Option 2: 21

Option 3: 25

Option 4: 20

Question : The circumference of a circle is equal to the perimeter of an equilateral triangle. If the radius of the circle is 7 cm, what is the length of the side of the equilateral triangle?

Option 1: $\frac{22}{3}$ cm

Option 2: $\frac{44}{3}$ cm

Option 3: $44$ cm

Option 4: $22$ cm

Question : The area of a sector of a circle is 110 cm² and the central angle of the sector is 56°, what is the circle's radius? (Take $\pi=\frac{22}{7}$)

Option 1: 35 cm

Option 2: 20 cm

Option 3: 25 cm

Option 4: 15 cm

Question : The slant height and radius of a right circular cone are in the ratio 29 : 20. If its volume is $4838.4 \pi ~\mathrm{cm}^3$, then its radius is:

Option 1: 28 cm

Option 2: 20 cm

Option 3: 25 cm

Option 4: 24 cm