Dengan menggunakan sifat kesebangunan diperoleh

<img align="middle" alt="begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell AD over AB end cell equals cell DE over BC end cell row cell 10 over AB end cell equals cell 8 over 12 end cell row AB equals cell fraction numerator 10 cross times 12 over denominator 8 end fraction end cell row AB equals 15 end table end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd»«mfrac»«mi»AD«/mi»«mi»AB«/mi»«/mfrac»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mi»DE«/mi»«mi»BC«/mi»«/mfrac»«/mtd»«/mtr»«mtr»«mtd»«mfrac»«mn»10«/mn»«mi»AB«/mi»«/mfrac»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mn»8«/mn»«mn»12«/mn»«/mfrac»«/mtd»«/mtr»«mtr»«mtd»«mi»AB«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mrow»«mn»10«/mn»«mo»§#215;«/mo»«mn»12«/mn»«/mrow»«mn»8«/mn»«/mfrac»«/mtd»«/mtr»«mtr»«mtd»«mi»AB«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»15«/mn»«/mtd»«/mtr»«/mtable»«/mstyle»«/math»" height="130" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -66px;" width="98" />

sehingga diperoleh

&nbsp;<img align="middle" alt="begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row DB equals cell AB minus AD end cell row blank equals cell 15 minus 10 end cell row blank equals 5 end table end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd»«mi»DB«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mi»AB«/mi»«mo»-«/mo»«mi»AD«/mi»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»15«/mn»«mo»-«/mo»«mn»10«/mn»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»5«/mn»«/mtd»«/mtr»«/mtable»«/mstyle»«/math»" height="50" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -26px;" width="86" />

Jadi, panjang&nbsp;<img align="middle" alt="begin mathsize 14px style DB end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi»DB«/mi»«/mstyle»«/math»" height="11" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -1px;" width="18" />&nbsp;adalah&nbsp;<img align="middle" alt="undefined" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mn»5«/mn»«mo»§#160;«/mo»«mi»cm«/mi»«/mrow»«/mstyle»«/math»" height="11" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -1px;" width="33" />.

Perhatikan gambar berikut!

<img alt="" src="https://imgix2.ruangguru.com/assets/miscellaneous/jpg_mgeplp_4801.JPG" style="width: 254px; height: 145px;" />

Tentujan panjang DB !<img align="middle" alt="undefined" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mo»§#160;«/mo»«/mstyle»«/math»" height="5" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAFCAYAAABirU3bAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAEx0lWhwAAAAxJREFUeNpjYKABAAAAVQAB8vOvGAAAAG90RVh0TWF0aE1MADxtYXRoIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8xOTk4L01hdGgvTWF0aE1MIj48bXN0eWxlIG1hdGhzaXplPSIxNHB4Ij48bW8+JiN4QTA7PC9tbz48L21zdHlsZT48L21hdGg+EzxlwgAAAABJRU5ErkJggg==" style="max-width: none; vertical-align: -1px;" width="4" />&nbsp;

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Perhatikan gambar berikut! Tentujan panjang DB ...

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