2007-04-11 11:48:25 · 7 answers · asked by Justin O 1 in Science & Mathematics ➔ Mathematics
2(3x10) + 2(10x18) + 2(18x3)=
528 square inches
2007-04-11 11:51:34 · answer #1 · answered by St. 1 3 · 0⤊ 0⤋
This problem sounds complex, but it is really easy. All you need to know how to do is find the area of a rectangle. This box is made up of 6 rectangles (one on each side). Each side has a corresponding and equivelant opposite side.
What all this means, is that we find the area of three different sides, add them together and multiply by two. This makes sure that we have accounted for all surfaces.
So, we have these three sides...
3" x 10"
3" x 18"
10" x 18"
Find the area of each of these sides...
3 x 10 = 30 sq in
3 x 18 = 54 sq in
10 x 18 = 180 sq in
adding these together gives us 264 sq in. Remember, this only accounts for 3 sides, so multiplying by two, we get...
Surface area of rectangle 528 sq in.
2007-04-11 11:55:22 · answer #2 · answered by Jason G 2 · 0⤊ 0⤋
a rectangular prism has 6 sides. the surface area of the front and back are the same, the two sides are the same, and the top and bottom are the same. so find these three values, multiply each by 2, and add them together:
front and back:
18(3) = 54, doubled: 108
sides:
10(3) = 30, doubled: 60
top and bottom:
18(10) = 180, doubled: 360
108 + 60 + 360 = 528 inches^2
2007-04-11 11:52:13 · answer #3 · answered by Link 4 · 0⤊ 0⤋
A=2(wl+wh+hl)
A=2(3*10+3*18+10*18)
A=2(30+54+180)
A=2*264
A=528 in^2
2007-04-11 11:53:05 · answer #4 · answered by yupchagee 7 · 0⤊ 0⤋
You have to add up the area of the rectangle formed by each side of the box.
2 sides x 3 inches x 10 inches
2 sides x 10 inches x 18 inches
2 sides x 18 inches x 3 inches
Multiply it up and add the three numbers together.
2007-04-11 11:52:08 · answer #5 · answered by CG 6 · 0⤊ 0⤋
((3X10)2)+((10X18)2)+((3X18)2) ... pretty sure.
2007-04-11 11:53:45 · answer #6 · answered by Anonymous · 0⤊ 0⤋
how about 4.083333...... sq.ft.
2007-04-11 11:55:29 · answer #7 · answered by ron and rasta 4 · 0⤊ 0⤋