Answer:
66°
Step-by-step explanation:
For this type of question, first you should know that all the three angles of a triangle sum up to 180°. Let's say the three angles are ∠a, ∠b and ∠c, so if we add the values of all these three angles they would always be equal to 180°.
In this question, we are given the measure of two angles and are asked to find the third angle:
75° + 39° + ? = 180°
? = 180° - 75° + 39°
? = 66° Answer
Hope that helps...
