Angle a is a right angle in △ABC. Which side is opposite angle C?
Answer: In the above triangle △ABC, the side opposite to angle C is AB.
Let's understand the solution.
The opposite side to a specific angle is the side that doesn't contain that particular angle in the triangle, that is, the opposite side to a specific angle can never be adjacent to that angle.
From the given figure, we can see that both sides AC and BC are adjacent to angle C.
Only, side AB doesn't contain angle C.
Hence, in the above triangle △ABC, the side opposite to angle C is AB.