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

(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 \( m^2 \)