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Mathematics 8 Online
OpenStudy (anonymous):

How do you find the surface area of a rectangular prism?

terenzreignz (terenzreignz):

A rectangular prism has 6 faces, no?

OpenStudy (anonymous):

Yes

terenzreignz (terenzreignz):

Well, every such face is a rectangle. Right?

terenzreignz (terenzreignz):

|dw:1363265699161:dw|

OpenStudy (anonymous):

Yes.. Wait, to find the surface area, do you find the area of one of the rectangles and multiply by 6?

terenzreignz (terenzreignz):

No. You only do that with cubes....

terenzreignz (terenzreignz):

Okay, observe... there are six faces, but the face opposite this one... |dw:1363265934143:dw| has the same area, right?

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