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S.chand books class 8 maths solution chapter 25 Areas of Rectilinear Figures exercise 25 A

EXERICSE 25 A
1.(i) Find the perimeter and area of a square whose one side is 6.5cm long.
(ii) Find the area of a square whose perimeter is 124 cm.
(iii) Find the perimetr and diagonal of a square whose area is 64 cm^2

2.Find in hectares the area of a square-shaped field 14km long.

3.Copy and complete the following table for rectangles:
<div style=”overflow:auto;”>
<table style=”border-collapse: collapse;” border=”1″>
<tr><th></th><th>Length</th><th>Breadth</th><th>Area</th><th>Perimeter</th></tr>
<tr><td>(i)</td><td>4.4cm</td><td></td><td>77cm^2</td><td></td></tr>
<tr>(ii)<td>20 mm</td><td></td><td></td><td>104 mm</td></tr>
<tr>(iii)<td>1.5 km</td><td>90 m</td><td>ha</td><td></td></tr>
<tr>(iv)<td>40 m</td><td></td><td>1 are</td><td></td></tr>
</table>
</div>

4.Find the area of a rectangle plot, one side of which is 48 m and its diagonal is 50 m

5.The perimeter of a rectangle is 98 cm and its breadth is 9cm. Find its
(i) Length
(ii) Length of diagonal
(iii) Area

6.The area of a square is 1 hectare. Calculate its:
(i) perimeter
(ii) length of diagonal

7.How many tiles of area 15cm^2 will be needed to conver a floor 5.65m by 6.90m ?

8.A room of dimensions 5.4m by 4.6m . A carpet is laid centrally, leaving a margin of 40cm all around between the carpet and the walls of the room. Find the area of the carpet in square meters.

9.Find the areas of the shaded parts in figs.(i) to (iii) . All corners are right-angled.
(i)
(ii)
(iii)

10.An open tank is 3m long, 2m wide and 1m50cm deep. Find the amount of paint required to paint its inside and outside, if 1 kg of paint cover 20 square meter (Neglect the thickness of the material)

11.A photograph 25cm by 20cm is mounted on a card so that there is margin of 2.5cm all the way round. What fraction of the card is covered ?

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