Question : In a circle with centre O, arc CD subtends an angle of 60° at the centre of the circle whose radius is 21 cm. Calculate the length of the arc CD.

Option 1: 20 cm

Option 2: 18 cm

Option 3: 24 cm

Option 4: 22 cm

Question : What is the measure of the central angle of the arc whose length is 11 cm and the radius of the circle is 14 cm?

Option 1: 45$^\circ$

Option 2: 60$^\circ$

Option 3: 75$^\circ$

Option 4: 90$^\circ$

Question : An arc of length $33 \pi\;\mathrm{cm}$ subtends an angle of $132^\circ$ at the centre of the circle. Find the radius of the circle.

Option 1: $45\;\mathrm{cm}$

Option 2: $40\;\mathrm{cm}$

Option 3: $30\;\mathrm{cm}$

Option 4: $35\;\mathrm{cm}$

Question : In a circle, an arc subtends an angle of 84° at the centre. If the length of the arc is 22 cm, then the radius of the circle (in cm) is equal to:
Take $\pi=\frac{22}{7}$

Option 1: 19

Option 2: 15

Option 3: 17

Option 4: 13

Question : The area of a sector of a circle is 616 cm² with a central angle of 10°. The radius of the circle is_____.
(use $\pi=\frac{22}{7}$)

Option 1: 84 cm

Option 2: 21 cm

Option 3: 48 cm

Option 4: 28 cm