Q58 of 61 Page 93

Find all the possible dimensions (in natural numbers) of a rectangle with a perimeter 36cm and find their areas.

Perimeter of rectangle = 36 cm.

2 × (l + b) = 36

l + b = 18

So l × b = 16 × 2; 14 × 4; 12 × 6 etc.

Area for l × b = 16 × 2 = 32 sq.cm

Area for second case = 14 × 4

= 56 sq.cm

Area for third case = 12 × 6

= 72 sq.cm

The area of a rectangular field is 1600sqm. If the length of the field is 80m, find the perimeter of the field.

The area of each square on a chess board is 4sqcm. Find the area of the board.

(a) At the beginning of game when all the chess men are put on the board, write area of the squares left unoccupied.

(b) Find the area of the squares occupied by chess men.

Find all the possible dimensions (in natural numbers) of a rectangle with an area of 36sqcm, and find their perimeters.

Find the area and Perimeter of each of the following figures, if area of each small square is 1sqcm.