Name the angle pair Adjacent Angles
Linear Pair
Vertical Angles
Complementary Angles

Complementary angles always add to 90 degrees

You can think of the "co" in complementary referring to "corner", since both words start with "co".

In contrast, supplementary lines form a straight angle (ie the angles add to 180). "Supplementary" and "straight" both start with S to help remember the term.

The angles shown are adjacent, but the term complementary is a better description I think. The angles are not vertical angles.

Since b+64 = 90, this equation solves to b = 26 after subtracting 64 from both sides.

a. is correct