6.
ABCD is a given rectangle with length as 90 cm and breadth as 80 cm. P, Q, R, S are the mid-points of sides AB, BC, CD, DA, respectively. A circular rangoli of diameter 20 cm is drawn at the centre as shown in the given figure. Find the area of shaded portion.
19.
In a city, one out of every 5 people is illiterate. If there are 82,20,270 men and 69,15,275 women in the city. How many people are literate?