Final answer:
The measure of the third angle in the triangle is 109 degrees.
Step-by-step explanation:
In a triangle, the sum of the angles is always 180 degrees.
So, to find the measure of the third angle, subtract the sum of the given angles from 180:
Third angle = 180 - (54 + 17) = 109 degrees
Therefore, the measure of the third angle is 109 degrees.
Learn more about Triangle angles