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
(a) We know that,
Area of rectangle = Length × Breadth
Length of rectangle, l = 3 cm
Breadth of rectangle, b = 4 cm
Therefore,
Area of rectangle = Length × Breadth = 3 × 4 = 12 cm2
(b) We know that,
Area of rectangle = Length × Breadth
It is given in the question that,
Length of rectangle, l = 12 m
Breadth of rectangle, b = 21 m
Therefore,
Area of rectangle = Length × Breadth = 12 × 21 = 252 m2
(c) We know that,
Area of rectangle = Length × Breadth
It is given in the question that,
Length of rectangle, l = 2 km
Breadth of rectangle, b = 3 km
Therefore,
Area of rectangle = Length × Breadth = 2 × 3 = 6 km2
(d) We know that,
Area of rectangle = Length × Breadth
It is given in the question that,
Length of rectangle, l = 2 m
Breadth of rectangle, b = 70 cm = 0.70 m
Therefore,
Area of rectangle = Length × Breadth
= 2 × 0.70
= 1.40 m2