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

Question : The perimeter of a sector of a circle of radius 7.4 cm is 20.6 cm. The area of this sector is:

Option 1: 42.92 cm²

Option 2: 5.8 cm²

Option 3: 10.73 cm²

Option 4: 21.46 cm²

Question : Find the surface area of a sphere whose radius is 3.5 cm. Use $(\left.\pi=\frac{22}{7}\right)$.

Option 1: 154 cm²

Option 2: 152 cm²

Option 3: 146 cm²

Option 4: 160 cm²

Question : A copper wire is bent in the form of a square and it encloses an area of 30.25 cm². If the same wire is bent to form a circle, then find the area of the circle.
[Use $\pi=\frac{22}{7}$]

Option 1: 38.50 cm²

Option 2: 42.25 cm²

Option 3: 35 cm²

Option 4: 30.25 cm²

Question : The circumference of a circle is 132 cm. The area of the circle is: (Take $\pi=\frac{22}{7}$)

Option 1: 1380 cm²

Option 2: 1322 cm²

Option 3: 1086 cm²

Option 4: 1386 cm²