EXTRA CREDIT: Regular hexagon ABEFGH and regular quadrilateral BCDE meet at vertices B and E and share common edge BE.
What is the measure DEF?
120
150
210
130
WILL GIVE BRAINLIST

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

I’m confused as to what you are asking 66 2/3 percentage wise