In the diagram below, lines AB, CD, and EF all intersect at the common point E. If CD bisects angle AGF and angle AGD=68° then what is the measure of angle BGF ? Explain how you arrived at your answer.

Answer:
m<BGF = 44°
Step-by-step explanation:
Since line CD bisects angle AGF, it implies that the measure of angle AGF is twice the measure of angle AGD.
m<AGD = 68°, therefore,
m<AGF = 2*AGD
m<AGF = 2*68°
m<AGF = 136°
m<AGF + m<BGF = 180° (linear pair)
136° + m<BGF = 180° (Substitution)
Subtract 136° from each side
m<BGF = 180° - 136°
m<BGF = 44°