I don’t see the questions?!
Answer:
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Step-by-step explanation:
The sum of all the three angles of any triangle is 180°
Putting sum of all the angles given equals to 180°

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The value of the x is found on solving the given angles of the triangles.
Did you mean the Pythagorean theorem? If so I believe that the answer would be that the Pythagorean theorem is used any time there is a right triangle.