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

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Solution

It is known that,

Area of rectangle = Length × Breadth

(a) l = 3 cm

b = 4 cm

Area = l × b = 3 × 4 = 12 cm²

(b) l = 12 m

b = 21 m

Area = l × b = 12 × 21 = 252 m²

(c) l = 2 km

b = 3 km

Area = l × b = 2 × 3 = 6 km²

(d) l = 2 m

b = 70 cm = 0.70 m

Area = l × b = 2 × 0.70 = 1.40 m²

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