Question

The total surface area of the rectangular box open at the top with length l units, breadth b units and height h units
A: 2lb+2bh+2lh
B: 2bh+2hl
C: lb+2bh+2hl
D: lb+bh+hl

Answer 1

Answer:

Ib Sendkksodir islye ni ho rha

Answer 2

Answer:

c) lb+2bh+2hl

Step-by-step explanation:

Rectangular box i.e cuboid

Surface area of cuboid: 2(lb+bh+hl) ....(1)

Box is open at top i.e Rectangular area is missing

area of rectangle: l * b or lb ...(2)

subtracting 2 from 1, we get

2lb+2bh+2hl - lb = lb+2bh+2hl