The four walls of a room are going to be wallpapered. The room is shaped like a rectangular prism, and its length, width, and height are 20 ft, 18 ft, and 9 ft, respectively. How much wallpaper is needed to complete the job?....Can you explain how you came up with the answer and the steps please!!!
2007-02-12 05:41:38 · 11 answers · asked by MEB 2 in Science & Mathematics ➔ Mathematics
two walls are 20 by 9
2 walls are 18 by 9
so area of a 20 by 9 wall is 180 sq ft
area of a18 by 9 wall is 162 sq ft
so 180+180 for the 20 by 9 walls
and 162+162 for the 18 by 9 walls
180+180+162+162=684 sq ft
2007-02-12 05:47:05 · answer #1 · answered by dla68 4 · 0⤊ 0⤋
You will have to calculate the area of the four walls separately and add them up.
Area of Wall-1 = L * H = 20 * 9 = 180 ft^2
Area of Wall-2 = W * H = 18 * 9 = 162 ft^2
Area of Wall-3 = L * H = 20 * 9 = 180 ft^2
Area of Wall-4 = W * H = 18 * 9 = 162 ft^2
Sum of the areas = 684 ft^2
That is your answer
2007-02-12 13:46:35 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Area of front wall = l x h = 20 x 9 ft² = 180 ft²
Area of back wall = l x h = 20 x 9 ft² = 180 ft²
Area of right hand wall = 18 x 9 ft² = 162 ft²
Area of left hand wall = 18 x 9 ft² = 162 ft²
Total area = 360 + 324 ft²
Total area = 684 ft²
2007-02-12 14:09:01 · answer #3 · answered by Como 7 · 0⤊ 0⤋
The first thing you need is the area in square ft. of all the walls. These would be two walls @ 20 by 9 &two walls @18 by 9.
20 by 9 =180 +180=360 and 18 by 9 =162 +162 = 324
324 +360 = 684 sq.ft.
2007-02-12 13:54:05 · answer #4 · answered by unpop5 3 · 0⤊ 0⤋
It is a rectangular prism, which will have two identical opposite walls, as room dimensions given by, wall will be
20 x 9 - 2 nos
and
18 x 9 - 2 nos
Total sq ft of wall paper needed
= 20*9*2 + 18*9*2
= 360 + 324
= 684 sq ft
2007-02-12 13:51:59 · answer #5 · answered by Mritunjay 2 · 0⤊ 0⤋
Well you have 2 walls that are 20 x 9 and 2 walls that are 18 x 9...I am assuming you aren't walpapering the ceiling and the floor and this is also assuming that you don't have any windows or doors...because you wouldn't wallpaper those. So the answer is
2 x ((20 x 9) + (18 x 9)) = 684 square feet
2007-02-12 13:47:58 · answer #6 · answered by David G 2 · 0⤊ 0⤋
there are two 9x18 walls and two 9x20 walls
9 * 18 = 162 ft²
9 * 20 = 180 ft²
(2 * 162 ft²) + (2 * 180 ft²) = 694 ft²
this does not take into consideration the fact that there might be window(s) that don't need wallpaper and there must be a door and it might not need wall paper
2007-02-12 13:57:45 · answer #7 · answered by michaell 6 · 0⤊ 0⤋
Each wall is a rectangle there are two with base 20 feet an two with base 18 feet.All have the height of the prism
Wallpaper = 2*(20+18)*9 =684 sqare feet
2007-02-12 13:48:40 · answer #8 · answered by santmann2002 7 · 0⤊ 0⤋
There are four walls:
2 walls have area (9x18) and two have area (9x20).
2*9*18 + 2*9*20 = 18(18+20)
A = 18(38)
A = 684 ft²
2007-02-12 13:47:25 · answer #9 · answered by bequalming 5 · 0⤊ 0⤋
Multiply 20(18)(9) = 3240 sq. ft. Now you need to know how much each roll of wallpaper will cover.
2007-02-12 13:44:45 · answer #10 · answered by richardwptljc 6 · 0⤊ 0⤋