Because they are two acute angles that add up to 90 degrees.
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Yes
no. the angles in a triangle must add up to 180 degrees. The right triangles must have an right angle (90 degrees). If you add up all the angles they will not measure 180 degrees.
Yes. The general rule for angles is that the sum of the angles must be 180 degrees.
a triangle has 180º so 180-90-25= 65
a right triangle has only one angle that measures 90 degrees. Since all three angles need to add to 180, the other two must add up to 90, so, yes, you can have two other angles that are 65 and 25 since they add to 90; but they are not right angles, of course.