Q 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 cm

Answers (1)

We know that area of a rectangle = length \times breadth
Therefore,
(a) Here length is 3cm and the breadth of the rectangle is 4cm
       So, the area of the rectangle 
        = 3 \times 4 = 12\ cm^2
(b) Here length is 12m and the breadth of the rectangle is 21m
       So, the area of the rectangle 
        = 12 \times 21 = 252\ m^2
(c) Here length is 3km and the breadth of the rectangle is 3km
       So, the area of the rectangle ?
       = 2 \times 3 = 6\ km^2
(d)  Here length is 2m and the breadth of the rectangle is 70cm = 70/100 = 0.7 m
        So, the area of the rectangle 
        =2 \times 0.7= 1.4\ m^2

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