What points do the two passages have in common

In △abc the angle bisectors drawn from vertices a and b intersect at point d. find ∠adb if: ∠c= γ

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.

How did the byzantine culture influence russia?