List of top Mathematics Questions on Areas Related to Circles asked in Bihar Board X

The radii of two circles are 19 cm and 9 cm respectively. Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles.
The length of the minute hand for a clock is 7 cm. Find the area swept by it in 40 minutes.
The ratio of the circumferences of two circles is 5:7; then the ratio of their radii is
The ratio of the radii of two circles is 3:4, then the ratio of their areas is
The area of the sector of a circle of radius 42 cm and central angle 30\(^\circ\) is