Trivia in Math!!!!!

Q: What's a flat image that can be displayed in three dimensions?
A: A hologram. 

Q: What number does "giga" stand for?
A: One billion. 

Q: What digit did Arab mathematician al-Khwarizmi give to the West around 800 B/B.?
A: Zero. 

Q:  What T-word is defined in geometry as "a straight line that touches a curve but continues on with crossing it"?
A:  Tangent.

Q: What two letters are both symbols for 1,000?
A: K and M.