• # question_answer 19) Find the areas of the rectangles whose sides are (a) 3 cm and 4 cm (b) 2 m and 21 m (c) 2 km and 3 km (d) 2 m and 70 cm TIPS If the length and breadth of a rectangle are given, then Area of rectangle = Length $\times$ Breadth.

(a) Here, length of the rectangle = 4 cm and breadth of the rectangle = 3 cm $\therefore$ Area of rectangle = Length $\times$ Breadth $=4\text{ }cm\times 3\text{ }cm=12\text{ }sq\text{ }cm$ Hence, the area of the rectangle is 12 sq cm. (b) Here, length of the rectangle = 21 m and breadth of the rectangle = 12 m $\therefore$ Area of rectangle = Length $\times$ Breadth $=3km\times 2km=6$ Hence, the area of the rectangle is 252 sq m. (c) Here, length of the rectangle = 3 km and breadth of the rectangle = 2 km $\therefore$ Area of rectangle = Length $\times$ Breadth $=3km\times 2km=6sqkm$ Hence, the area of the rectangle is 6 sq km. (d) Here, length of the rectangle = 2 m and breadth of the rectangle = 70 cm $=70\times \frac{1}{100}m$ $\left[ \because 1cm=\frac{1}{100}m \right]$ $=\frac{70}{100}m=0.70m$ $\therefore$ Area of rectangle = Length x Breadth $=2\text{ }m\text{ }\times 0.70\text{ }m=1.40\text{ }sq\text{ }m$ Hence, the area of the rectangle is 1.40 sq m.