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What is the surface area of a rectangular prism with a length of 12 Cm a width of 6 Cm and a height of 4 Cm?
In general, answering a question which asks you to calculate the surface area of a shape means that you have to find the area of ALL the faces of that shape and add them up. In your case, you've got a rectangular prism (which in other words, is a cuboid.) Cubes and cuboids have 6 faces so you have to calculate the area of all 6 faces and then add them up.
It is really very difficult to fully explain this in written words over the internet without any pictures or without being face-to-face explaining this to you since attempting a question like this requires a lot of visualising.
I can however, just give you the answer.
6 x 4 = 24cm2
6 x 4 = 24cm2
6 x 12 = 72cm2
6 x 12 = 72cm2
4 x 12 = 48cm2
4 x 12 = 48cm2 +
----------------------
= 288cm2
Essentially what I did was calculate the area of each of the 6 faces based on the measurements you gave me and then added them up.
NOTE: Remember, that what we are calculating is AREA and because the measurements were in centimetres, the units were cm2
Hope that helps.
Jamz159
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