question_answer 1)

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.

Answer:

(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.