Hii !

I need Help For This Exercice :

Either a triangle and point belonging to such as :

, , .

Find / Calculate .

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- Feb 4th 2010, 10:06 AMPerelmanHelp Géo !!!
Hii !

I need Help For This Exercice :

Either a triangle and point belonging to such as :

, , .

Find / Calculate . - Feb 4th 2010, 10:59 PMearboth
- Feb 5th 2010, 01:56 AMearboth
1. In the right triangle DCS you have:

**..........[1]**

2. In the triangle ABD you have:

3. In the right triangle left of A you have:

4. Now use similar right triangles:

which yields:**..........[2]**

5. Combine [1] and [2] and you have to solve for x:

6. After moving some stuff around you'll get:

7. You can show that x = -2 must be a solution of the equation, that means you can factor the LHS:

8. Therefore the only possible solution is