Pada kubus KLMN.PQRS, KM adalah diagonal bidang alas yang panjangnya <img align="middle" alt="begin mathsize 14px style straight a square root of 2 end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi mathvariant=¨normal¨»a«/mi»«msqrt»«mn»2«/mn»«/msqrt»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />&nbsp; dengan a adalah panajng rusuk kubus. Jadi, panjang KM adalah <img align="middle" alt="begin mathsize 14px style 13 square root of 2 space cm end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mn»13«/mn»«msqrt»«mn»2«/mn»«/msqrt»«mo»§#160;«/mo»«mi»cm«/mi»«/mrow»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />.

Kubus KLMN.PQRS di bawah memiliki panjang rusuk 13 cm. Panjang KM adalah...

<img alt="" src="https://imgix2.ruangguru.com/assets/miscellaneous/png_olie8d_8645.png" style="width: 300px; height: 269px;" />

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Kubus KLMN.PQRS di bawah memiliki panjang rusuk 13...

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