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anonymous

  • one year ago

The surface area of a cube is 864 in2. What is the area of one face of this cube?

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  1. rishavraj
    • one year ago
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    surface area of cube = 6a^2 so \[6 a^2 = 864\] once u get the side length i.e "a" u can calculate the area of one face

  2. anonymous
    • one year ago
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    @jim_thompson5910

  3. anonymous
    • one year ago
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    what 6*6*6=216 not 864

  4. anonymous
    • one year ago
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    i dont get it

  5. rishavraj
    • one year ago
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    see the surface area of a cube with side length "a" = \[6 a^2\] the given surface area is 864 so \[6 a^2 = 864\]

  6. anonymous
    • one year ago
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    so 6 is the ans

  7. wil476003
    • one year ago
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    No ur over thinking it you just have to divide 864 by 6 so the answer is 144

  8. anonymous
    • one year ago
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    o ok

  9. mathstudent55
    • one year ago
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    A cube is made up of 6 faces. You are given the total surface ares of the 6 faces. You want the surface area of one single face. This is a one-step problem involving only one operation.

  10. rishavraj
    • one year ago
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    no no .....once u solve tht ....i mean get the side length |dw:1435892850326:dw|

  11. anonymous
    • one year ago
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    so 12??

  12. wil476003
    • one year ago
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    No

  13. rishavraj
    • one year ago
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    now u r havmg the sidelength .... so the area of one side = a^2 so the answer is (12)^2 = 144

  14. anonymous
    • one year ago
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    ok thanks

  15. wil476003
    • one year ago
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    The answer is still 144 he just used more steps

  16. mathstudent55
    • one year ago
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    @rishavraj Why bother getting the side, when the answer is simply the area of one face? \(A_{total} = 6s^2\) \(A_{one~face} = \dfrac{A_{total}}{6} = \dfrac{864~in.^2}{6} = 144~in.^2 \)

  17. rishavraj
    • one year ago
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    @mathstudent55 oo yeah my bad.....

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