1. angles with measures that add to 90°
2. angles with sides that form two pairs of opposite rays
3. angles in the same plane with a common vertex and a common side but no common interior points.
4. angles with measures that add to 180°
adjacent angles
supplementary angles
vertical angles
complementary angles

1.complementary angles

2.adjacent angles?

3.vertical angles?

4.supplementary angles

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6