The sum of the interior angles of a triangle is 180 degrees. If one angle is 90, that leaves 90 for the other two angles. You can't have another angle of 90 and an angle of 0, so there can only be one angle in a triangle that measures 90 degrees.
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The sum of the internal angles of a triangle is 180º. If B is a right angle it has 90º, so there are only 90º left for the other two angles, meaning that they cannot be right!
A triangle cannot have four angles.
No; a right triangle cannot have two angles that are measured 38 and 54 degrees. This is because a right triangle must have one angle that is equal to 90 degrees, for this is a basic property of a right triangle. The sum of the angles in the triangle must be 180 degrees. In order to prove that there indeed cannot be a triangle with angles measuring 90, 38, and 54 degrees, you add the three. If their sum is greater than 180 degrees, then it is impossible; as in this case, where the sum totals to 182 degrees.
You cannot prove "a right angle triangle". You may or may not be able to prove statements about right angled triangles but that will depend on the particular statement.
If it has no right angles, it is not a right triangle and therefore you cannot name a hypotenuse of that triangle. Which implies you cannot find that side's measure.