Q.1 Find the area 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

Area of rectangle = Length × Breadth
(a) l = 3 cm and b = 4 cm
Area = l × b = 3 × 4 = 12 \( cm^2 \)
(b) l = 12 m and b = 21 m
Area = l × b = 12 × 21
= 252 \( m^2 \)
(c) l = 2 km and b = 3 km
Area = l × b = 2 × 3
= 6 \( km^2 \)
(d) l = 2 m and b = 70 cm = 0.70 m
Area = l × b = 2 × 0.70
= 1.40 \( m^2 \)