Question 1176926
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Assume angle A is obtuse.  Then the measure of angle A is greater than 90 degrees.  Since angle B is right, the measure of angle B is 90 degrees.  Then, regardless of the measure of angle C, the sum of the three angles is greater than 180 degrees.  This contradicts the fact that the sum of the angles of any triangle is 180 degrees.  Therefore the initial assumption is false -- Angle A is not obtuse (nor is it right for that matter).


																
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
*[illustration darwinfish.jpg]

From <https://www.algebra.com/cgi-bin/upload-illustration.mpl> 
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