1. Perimeter of a sector of a circle whose central angle is 90° and radius 7 cm is
2. The area of a circle that can be inscribed in a square of side 10 cm is
3. The perimeter of a square circumscribing a circle of radius a units is
4. The perimeter of the sector with radius 10.5 cm and sector angle 60° is
5. In a circle of diameter 42 cm, if an arc subtends an angle of 60° at the centre, where π = \(\frac{22}{7}\) then length of arc is
6. The perimeter of a sector of radius 5.2 cm is 14 cm, the area of the sector is
7. If the perimeter of a semicircular protractor is 72 cm where π = \(\frac{22}{7}\), then the diameter of protractor is
8. If the radius of a circle is doubled, its area becomes
9. If the sum of the circumferences of two circles with radii R1 and R2 is equal to circumference of a circle of radius R, then
10. The perimeter of a circular and square fields are equal. If the area of the square field is 484 m² then the diameter of the circular field is