Mathematics
The shaded portion of the figure, given alongside, shows two concentric circles.
If the circumference of the two circles be 396 cm and 374 cm, find the area of the shaded portion.
Related Questions
An express train is running between two stations with a uniform speed. If the diameter of each wheel of the train is 42 cm and each wheel makes 1200 revolutions per minute, find the speed of the train.
The minute hand of a clock is 8 cm long. Find the area swept by the minute hand between 8.30 a.m. and 9.05 a.m.
The base of a right triangle is 8 cm and its hypotenuse is 10 cm; the area of triangle is:
24 cm2
40 cm2
48 cm2
80 cm2