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The total number of degrees in a triangle is 180. this will not change no matter what type of triangle it is. (obtuse, acute, right angle, etc)
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A rotation or a reflection.
A better equation would be dE=dm*c2 showing that a change in mass is equivalent to a change in energy
This is possible because the order of the addends does not matter. For example, 3+8 is the same as 8+3. No matter how you list the addends, the sum will always be the same.