Question

A hall is 12m long 10m wide and 5m high. its wall and the roof are to be white washed from inside . find the total area to be white washed . also find its cost at the rate rupees 5.40 per sq.m.​

Answer 1

Answer:

first for four walls write the formula for lateral surface area of cuboid and then add it with the top area which is l× b

Answer 2

Step-by-step explanation:

length of hall is 12m

width of hall is 10m

Height of hall is 5m

The total area to be white washed from inside

= (length ×width) +2(length × height) +2 (height ×width)

= (12×10) +2(12×5) +2(5×10)

= 120 + 120 + 100

= 340 sq.m.

Therefore cost of white wash = 340 × 5.40

= 1836 rupees