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Diketahui sebuah kubus dengan panjang diagonal . L...

Diketahui sebuah kubus dengan panjang diagonal begin mathsize 14px style 22 space cm end style. Luas permukaan kubus tersebut adalah ...

  1. begin mathsize 14px style 1.331 space cm squared end style 

  2. size 14px 1 size 14px. size 14px 452 size 14px space size 14px cm to the power of size 14px 2 

  3. size 14px 1 size 14px. size 14px 542 size 14px space size 14px cm to the power of size 14px 2 

  4. size 14px 2 size 14px. size 14px 904 size 14px space size 14px cm to the power of size 14px 2 

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Panjang space diagonal space sisi end cell equals cell 22 space cm end cell row cell straight r square root of 2 end cell equals 22 row straight r equals cell fraction numerator 22 over denominator square root of 2 end fraction end cell row cell straight r squared end cell equals cell open parentheses fraction numerator 22 over denominator square root of 2 end fraction close parentheses squared end cell row cell straight r squared end cell equals cell 484 over 2 end cell row cell straight r squared end cell equals 242 end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Luas space kubus end cell equals cell 6 straight r squared end cell row blank equals cell 6 cross times 242 end cell row blank equals cell 1.452 space cm squared end cell end table end style

Jadi, jawaban yang tepat adalah B.

 

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