Question

find the area of the cardboard are required to make an open box of length 28 cm breadth 0.5 metre and height 0.2 metre ​

Answer 1

Answer:

Dimensions

length = 28 cm = 0.28m

Breadth = 0.5m

Height = 0.2m

Area of cardboard = Area of cuboid.

2(lb+bh+hl)

As it is given that it is open then we will add area of bottom to the lateral surface area of cuboid that is l*b

Lateral surface area = 2(l+b)*h

Hence are will be 2(l+b)*h + l*b

so,

=2(0.28+0.5)*0.2 + 0.28*0.5

=2*0.78*0.2+0.14

=2*1.56+0.14

=3.12+0.14

= 3.26 m²

= 326 cm²

Step-by-step explanation:

Answer is given in square metre and centimetre square. * means multipliy. I hope I helped u