Question

100 points =a hall is 20 m long , 12m wide and 7m high . its ceiling and four walls are to be plastered . find the area to be plastered​

Answer 1

Hey mate

Here is your answer

Lateral surface area of cuboid =2(lh+bh)

=2(12*7+20*7)

=2(84+140)=2*224=448

Area of ceiling =20*12=240

Total area =448+240=688 m sq

Hope it helps u

Answer 2

Answer:

688m2

Step-by-step explanations

lateral surface area 2×[l+b)

20*7(20+12)

14*32=448m2

area of ceiling l×b

12*20=240m2

total area 448+240= 688m^2