Question

A cuboidal box of external dimensions 84 cm by 64 cm by 17 cm (open from the top) is made up of wood of thickness 2 cm. Find the: (a) volume of the inner cuboid. (b) outer lateral surface area.​

Answer 1

Step-by-step explanation:

external dimensions ––

L = 84cm , B= 64cm, H = 17cm

thickness (d) = 2cm

internal dimensions are.....

l = L - 2d = 84 - 4 = 80cm

b = B - 2d = 64 - 4 = 60cm

and h = H - d = 17 - 2 = 15cm

(a) volume of inner cuboid = l × b × h

=> V = 80 × 60 ×15 cm³

=> V = 72000cm³

(b) outer lateral surface area = 2×h(l+b)

A = 2 × 15 (80+60)

A= 30 × 140

A = 4200cm²

Answer 2

Answer:

it is simple

volume of inner cuboid = multiply the inner dimensions

inner dimensions .....( length -2×2)

(breadth- 2×2)

(height -2 )

this sign is of subtraction - ...