# 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

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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