Final answer:
The measure of the third angle in the triangle is 75°.
Step-by-step explanation:
In a triangle, the sum of all three angles is always 180 degrees. Given that two of the angles measure 90° and 15° respectively, we can find the measure of the third angle by subtracting the sum of the two given angles from 180°.
The measure of the third angle = 180° - (90° + 15°) = 180° - 105° = 75°.
Therefore, the measure of the third angle is 75°.
Learn more about Angles in a triangle