Question

the internal dimensions of a cuboidal room are 13m*9m*4.5m. find the total cost of whitewashing all four walls of the room , if the cost of whitewashing is rupees 7 term^2.

Answer 1

Answer:

Step-by-step explaination:

lateral surface area = 2h(l+b)

= 2 × h ( l + b )

= 2 × 4.5 ( 9 + 13 )

= 9 × 22

= 198 $m^{2}$

cost of whitewashing the walls =  7 × 198

= ₹ 1386.00

Answer 2

Step-by-step explanation:

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

2(13+9)*4.5

2*22*4.5

44*4.5

198.0m^

198m^

Total cost of white washing the walls = 7*198

= Rs 1386