Question

1. Find the areas of the rectangles whose sides are:
(a) 3 cm and 4 cm
(b) 12 m and 21 m (c) 2 km and 3 km
2 Find the areas of the squares whose sides are.
(d) 2m and 70 cm

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Answer 1

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1. Find the areas of the rectangles whose sides are :-

a) 3 cm and 4 cm.

b) 12 m and 21 m.

c) 2 km and 3 km.

d) 2 m and 70 m

Solution :-

We know that,

☯ Area of the rectangle = length × breadth.

a) 3 cm and 4 cm.

Area = 3 × 4

        = 12 cm.

b) 12 m and 21 m.

Area = 12 × 21

        = 252 m.

c) 2 km and 3 km.

Area = 2 × 3

        = 6 km.

d) 2 m and 70 m.

Convert cm to m.

70 cm = 70/100                    

          = 0.7 m.

Area = 2 × 0.7

        =  1.4 m.

Answer 2

• Find the areas of the rectangles whose sides are :-

a) 3 cm and 4 cm.

b) 12 m and 21 m.

c) 2 km and 3 km.

d) 2 m and 70 m

Solution :-

We know that,

☯ Area of the rectangle = length × breadth.

a) 3 cm and 4 cm.

Area = 3 × 4

= 12 cm.

b) 12 m and 21 m.

Area = 12 × 21

= 252 m.

c) 2 km and 3 km.

Area = 2 × 3

= 6 km.

d) 2 m and 70 m.

Convert cm to m.

70 cm = 70/100

= 0.7 m.

Area = 2 × 0.7

= 1.4 m.

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