Answer:
Square. If the middle is 90° then all of them have to be.
4+1, 3+2, 2+3, 1+4. 4 total combinations, unless 4+1 and 1+4 are the same. In that case, there are only 2, 1+4, and 2+3
Answer:
1. A, 2 meters per second
2. F, 15

10 to the power of 6 equals 1,000,000.