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ABCD . EFGH adalah kubus dengan rusuk 10cm . Titik X , Y , dan Z adalah pertengahan EH , BG , dan AB . Hitunglah panjang XZ , YZ , dan XY .

ABCD.EFGH adalah kubus dengan rusuk .

Titik X, Y, dan Z adalah pertengahan EH, BG, dan AB. Hitunglah panjang XZ, YZ, dan XY.

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Karena AX adalah panjang rusuk, makanilai . Karena XZ adalah panjang rusuk, makanilai . Karena YZ adalah panjang rusuk, makanilai . Misal titik O adalah pertengahan FG , maka: Karena XY adalah panjang rusuk, makanilai .

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell E X end cell equals cell 1 half times E H end cell row blank equals cell 1 half times 10 end cell row blank equals cell 5 space cm end cell row blank blank blank row cell A Z end cell equals cell 1 half times A B end cell row blank equals cell 1 half times 10 end cell row blank equals cell 5 space cm end cell row blank blank blank row cell B Z end cell equals cell 1 half times A B end cell row blank equals cell 1 half times 10 end cell row blank equals cell 5 space cm end cell row blank blank blank row cell A X squared end cell equals cell A E squared plus E X squared end cell row blank equals cell 10 squared plus 5 squared end cell row blank equals cell 100 plus 25 end cell row blank equals 125 row cell A X end cell equals cell plus-or-minus square root of 125 end cell row blank equals cell plus-or-minus square root of 25 times 5 end root end cell row blank equals cell plus-or-minus 5 square root of 5 end cell end table end style

Karena AX adalah panjang rusuk, maka nilai undefined.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell X Z squared end cell equals cell A X squared plus A Z squared end cell row blank equals cell left parenthesis 5 square root of 5 right parenthesis squared plus 5 squared end cell row blank equals cell left parenthesis square root of 25 times 5 end root right parenthesis squared plus 5 squared end cell row blank equals cell left parenthesis square root of 125 right parenthesis squared plus 5 squared end cell row blank equals cell 125 plus 25 end cell row blank equals 150 row cell X Z end cell equals cell plus-or-minus square root of 150 end cell row blank equals cell plus-or-minus square root of 25 times 6 end root end cell row blank equals cell plus-or-minus 5 square root of 6 end cell end table end style

Karena XZ adalah panjang rusuk, maka nilai undefined.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell B Y end cell equals cell 1 half times B G end cell row blank equals cell 1 half times straight r square root of 2 end cell row blank equals cell 1 half times 10 square root of 2 end cell row blank equals cell 5 square root of 2 space cm end cell row blank blank blank row cell Y Z squared end cell equals cell B Y squared plus B Z squared end cell row blank equals cell left parenthesis 5 square root of 2 right parenthesis squared plus 5 squared end cell row blank equals cell left parenthesis square root of 25 times 2 end root right parenthesis squared plus 5 squared end cell row blank equals cell left parenthesis square root of 50 right parenthesis squared plus 5 squared end cell row blank equals cell 50 plus 25 end cell row blank equals 75 row cell Y Z end cell equals cell plus-or-minus square root of 75 end cell row blank equals cell plus-or-minus square root of 25 times 3 end root end cell row blank equals cell plus-or-minus 5 square root of 3 end cell end table end style

Karena YZ adalah panjang rusuk, maka nilai begin mathsize 14px style Y Z equals 5 square root of 3 space cm end style.

Misal titik O adalah pertengahan FG, maka:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell O X end cell equals cell 10 space cm end cell row cell O Y end cell equals cell 1 half times B F end cell row blank equals cell 1 half times 10 end cell row blank equals cell 5 space cm end cell row blank blank blank row cell X Y squared end cell equals cell O X squared plus O Y squared end cell row blank equals cell 10 squared plus 5 squared end cell row blank equals cell 100 plus 25 end cell row blank equals 125 row cell X Y end cell equals cell plus-or-minus square root of 125 end cell row blank equals cell plus-or-minus square root of 25 times 5 end root end cell row blank equals cell plus-or-minus 5 square root of 5 space end root end cell end table end style

Karena XY adalah panjang rusuk, maka nilai undefined.

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