In a right triangle, one angle is always 90°. The sum of the angles in any triangle is 180°. Given that one angle is 36° and the right angle is 90°, you can find the third angle by subtracting the sum of the known angles from 180°.
So the calculation is:
180° - 90° - 36° = 54°
Therefore, the measure of the third angle is 54°.