Answer:
D. 120°
Explanation:
Interior angles of a rhombus always add up to 360 degrees. Thus we can set up an equation:
g+g+2g+2g=360
Now let's combine all the like terms (g's).
6g=360
Now we divide both sides by six to isolate g.
g=60
We can now substitute g into angle B, to find its value.
2g
2(60)
120
Thus, the measure of angle B is 120, or option D.