A classroom is 6.8 m long, 3.5 m wide, and 270 cm high. Find the cost of plastering the 4 walls and ceiling at the rate of Rs.12 per m².
Incorrect answers will be reported...
Answers
ANSWER
Dimensions of the classroom :-
Length (long) = 6.8m
Breadth (wide) = 3.5m
Height = 270cm = 2.7m
Thus it's clear that it's a cuboid.
Now we've to find the curved surface area of the wall + the ceiling to find the total cost.
CSA of a cuboid = 2h(l + b)
Area of the ceiling = l × b (since it's rectangular)
Total area needed to be plastered = 2h(l + b) + lb
= 2 × 2.7 (6.8 + 3.5) + (6.8 × 3.5)
= (5.4 × 10.3) + 23.8
:-= 55.62 + 23.8
= 79.42m²
Total cost @ rupees 12 m² = 12 × 79.42
= Rupees 953.04
Hence, the total cost of plastering the four walls and the ceiling is Rs 953.04
Step-by-step explanation:
PLZ GIVE ME THANKS
Answer:
length = 6.8 m
breadth= 3.5m
270cm hight = 2.7m
area= area of 4 walls + area of ceiling
2h ( l+b ) + lb
2.7 ( 6.8+3.8) + 6.8×3.5
2×2.7(10.3)+23.8
79.42m²
cost is 1m² =12 rupes
cost of 79.42m²= 79.42× 12
953.04 rupes