When we see a half Moon in the sky, the lines between Earth, ...

[cdr_15]

When we see a half Moon in the sky, the lines between Earth, Moon, and Sun
 
  A) are equal in length.
  B) are parallel to one another.
  C) form a right triangle.
  D) all of the above

Question 2

Eratosthenes' measurements of Earth's size involved
 
  A) a deep well in Syene.
  B) a pillar's shadow in Alexandria.
  C) surveying the distance between Alexandria and Syene.
  D) all of the above

[jackie]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: D