Question

In Triangle ABC, AD | BC . Find the length of BC.
Please solve ​

Answer 1

Answer:

by Pythagoras in triangle ADC,

AC² = AD² + DC²

13². = 12² + DC²

169-144 = DC²

......DC² = 25

DC= 5 cm

similarly use Pythagoras in triangle ADB

You get BD = 5 cm

hence , BC = 5+5= 10 cm answer...

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Answer 2

$\bold{by \: Pythagoras \: in triangle \: ADC,}$

$\bold{AC² = AD² + DC²}$

$\bold{13² = 12² + DC²}$

$\bold{169-144 = DC²}$

$\bold{DC² = 25}$

$\bold{DC= 5 cm}$

$\bold{similarly \: use \: Pythagoras \: in \triangle{ ADB}}$

$\bold{You \: get \: BD = 5 cm}$

$\bold{hence , BC = 5+5= 10 cm }$