2 Figure ABCD is a parallelogram.
А
B
E
/1009
Buse
?
D
С
What is the measure of ZECB if
the measure of ZDEC is 100°?
70°
80°
90°
100°
А
B
с
D

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.