Math, asked by ayushi111203, 1 year ago

in ABC, AB=AC=x,BC=10cm and the area ofABC is 60 cm². find x

Answers

Answered by arnab2261
3
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Answered by Anonymous
0

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Drop a perpendicular from A to side BC and mark it as D

 =  > AD= \sqrt{ {x}^{2} -  {5}^{2}  }

 =  > area= \frac{1}{2} ×AD×BC

 =  > 60  =  \frac{1}{2}  \times  \sqrt{ {x}^{2} - 25 }   \times  10

 =  > 144 =  {x}^{2}  - 25

  {x}^{2}  = 169

x = 13cm

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