rectangular prism shows 5cm,4cm,8cm; find the surface area of the rectangular prism?
find the surface area of the rectangular prism with a length of 6cm, width 4cm, height 10cm?
2006-07-15 03:11:49 · 4 answers · asked by Anonymous in Education & Reference ➔ Homework Help
You have a length, a width, and a height. You have 6 faces on a rectangular prism, but you only need to find the surface areas of 3 of the faces and multiply the values by 2. (Because opposite faces will have the same surface area.)
For the three faces you have length x width, length x height, and width x height. The basic formula is 2lw + 2lh + 2wh or 2(lw + lh + wh).
For the first one, assume that the length is 5, the width is 4, and the height is 8. (It doesn't actually matter which number is which.)
2 x length x width = 2 x 5 x 4 = 40
2 x length x height = 2 x 5 x 8 = 80
2 x width x height = 2 x 4 x 8 = 64
So the total surface area is 40+80+64 = 184.
You can do the second one the same way, and you'll get 248.
2006-07-15 03:22:19 · answer #1 · answered by Anonymous · 1⤊ 0⤋
That's supposed to be a rectangular slab, not a prism.
2006-07-15 10:19:45 · answer #2 · answered by Anonymous · 0⤊ 0⤋
160 and 240
2006-07-15 10:17:01 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Please, to easy
2006-07-15 10:16:13 · answer #4 · answered by Puppy Zwolle 7 · 0⤊ 0⤋