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Mathematics 8 Online
OpenStudy (anonymous):

The surface area of a cube is 486 ft2. What is the area of one face of this cube?

OpenStudy (anonymous):

help @cwrw238

OpenStudy (anonymous):

@ignaris

OpenStudy (mathstudent55):

How many faces does a cube have?

OpenStudy (anonymous):

6

OpenStudy (mathstudent55):

|dw:1420405409003:dw|

OpenStudy (anonymous):

so is the answer2916

OpenStudy (mathstudent55):

Correct. If all the faces together have an area of 486 ft^2, then one face has that area ***divided*** by 6.

OpenStudy (anonymous):

thanks i gave you a medal

OpenStudy (mathstudent55):

What did you get?

OpenStudy (anonymous):

you help me understand more

OpenStudy (anonymous):

2916

OpenStudy (mathstudent55):

No. Read my explanation above. You need to divide, not multiply. When you answer math questions, the answers must make sense. If the entire cube has an area of 486 ft^2, does one single face have more area or less area than the entire 6 faces of the cube?

OpenStudy (anonymous):

o

OpenStudy (anonymous):

so 81

OpenStudy (mathstudent55):

1 face of the cube must have less area than all the 6 faces of the cube. That means the answer cannot be 1916 ft^2 which is much more than 486 ft^2. The answer is 486 ft^2 / 6 (Do a division, not a multiplication.)

OpenStudy (mathstudent55):

Correct. 81 ft^2

OpenStudy (anonymous):

omg thanks

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