Question

a classroom is 12 m long,9 m wide and 5 m high . Find the sum of the area of its floor and the four walls including doors, windows etc in breaf ​

Answer 1

Answer:

Area of four walls=210m^2

price will be =₹5250 or ₹131250

Step-by-step explanation:

Length=12m

breadth=9m

height= 5m

Area of four walls =leteral surface area=2(lh+bh)

=2(12*5+9*5)

=2(60+45)

=2(105)

=210m^2

if in question the price is given per meter square

Area of four walls=210m^2

rate of white washing per m^2=₹25

cost of white washing is =210*25

=₹5250

And if it is given per meter

then answer will be

the rate per m=25

therefore rate per meter square is =25^2=625

so cost for white washing will be =210*625

=₹131250

Answer 2

Answer:

$318$

Step-by-step explanation:

$Area= 12*9+ 2(12*5)+ 2(9*5)\\=108+ 2*60+ 2*45\\=108+ 120+ 90\\=318m^{2}$

This area excludes the area of the ceiling