Prove that if a triangle contains one right or obtuse angle, then the other two angles must be acute. (Note: You may not use the fact that the sum of the angles in a triangle is 180 degrees.)

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let the triangle have tw angles A, B, C. now A is an obtuse angle. therefore it must be greater than 90 degree so the other must be smaller than 90 degree therefore, they are acute angle.

Prove that if a triangle contains one right or obtuse angle, then the other two angles must be acute. (Note: You may not use the fact that the sum of the angles in a triangle is 180 degrees.)

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