Question

Find the area of four walls of a room whose dimensions are 6m×4m×3m
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Answer 1

Answer:

Area of a Couboid is= 2lb+2bh+2hl

or 2(lb+bh+hl)

=> 2( 6(4)+4(3)+6(3))

=> 2(24+12+18)

=> 2(54)

=> 108m²

Answer 2

It is given that length, breadth and height of a room are 8 m, 5 m and 3 m respectively.

Area of four walls of the room is: 2h(l+b)

A=2h(l+b)=2×3(8+5)=6×13=78 m²

a of the ceiling is:

A=l×b=8×5=40 m²

Total area of the four walls and the ceiling of the room is 78+40=118 m²

It is given that cost of white washing is Rs.15/m², therefore,

Total cost of white washing is: 118×15=1770

Hence, the cost of white washing ɪꜱ 1770 ʀꜱ

ᴍᴀʀᴋ ᴍᴇ ʙʀᴀɪɴʟɪᴇꜱᴛ ........☺️