If a triangle is a right triangle, then the other two angles must congruent vertical acute supplementary

The answer is acute angles.

Step-by-step explanation:

If a triangle is a right triangle, then the other two angles must be acute angles.

We know that the sum of a triangle is 180 degrees.

So, if one angle is 90 degrees or right angle, then the other two angles must be less than 90 degrees to form a total of 180 degrees.

And any angle less than 90 degrees is called an acute angle.

Therefore, the answer to the question is Acute angle.

he answer is x=1x3 because x=1 to x=3