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If one of the angles in a triangle is 90° the other two angles must add up to 90°. What fact is used to prove the truth of this statement?

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It is essential to be exact in math. If you can find a simple proof that precisely describes all cases of a particular situation it can save you time - no more checking a lot of different values.
 


If one of the angles in a triangle is 90° the other two angles must add up to 90°. What fact is used to prove the truth of this statement?





 
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