16.
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.
18.
25, 32, 481 people live in state A. 2, 82, 745 people moved from state B to state A and 18, 452 people moved from state A to state C. How many people now live in state A?