Final answer:
The third angle of the triangle measures 40°.
Step-by-step explanation:
In a triangle, the sum of all angles is always 180 degrees. Since we know that two angles of the triangle measure 90° and 50°, we can find the measure of the third angle by subtracting the sum of the given angles from 180 degrees.
Third angle = 180° - 90° - 50° = 40°.
So, the third angle of the triangle measures 40°. Hence, the correct answer is
b. 40⁰.
Learn more about Triangle angles