Two smaller circles touch a large circle internally and pass through the center O of the larger circle. If the diameter of the bigger circle is 28 cm, thenwhat is the area of the bigger circle which is not enclosed by the two smaller circles (in sq.cm)?
Pabitra had l of petrol in the fuel tank of his vehicle at the start of a journey. During the journey, l of petrol was consumed. What fraction of the initial petrol was left in the fuel tank after the journey?