Why did greeks believe the earth as a sphere?

Triangle xyz is translated 4 units up and 3 units left to yield triangle x'y'z' what is the distance between any two corresponding points on triangle xyz and trianglex'y'z' ?

Which of teh following would explain the importance of the trans-siberian railroad to russia's economy? (schoology test)

In recent times, what parts of texas are most likely to gain to representatives based on redistricting in recent years