Is the Star of David drawn by drawing a triangle and a upside down triangle overlapping it?
A: Yes, but the Star of David is always drawn with two equilateral triangles (meaning a triangle of 3 sides of equal length). This is different from what math and science call a hexagram which is simply a 6 pointed Star Polygon composed of two opposing triangles. For a true Star of David one must draw 2 equilateral triangles of the exact same size. Here are a few definitions to help in your understanding-
Star of David (Noun) - a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism. - Magen David, Mogen David, Shield of David, Solomon's seal
- WordNet 3.0 Dictionary (at The Free Dictionary.com)
Star of David (or Mogen David) A six-pointed star composed of two equilateral triangles, one superimposed upside down on the other; a symbol of Judaism.
- McGraw-Hill Dictionary of Architecture and Construction (2003)
Star of David (n.) an emblem symbolizing Judaism and consisting of a six-pointed star formed by superimposing one inverted equilateral triangle upon another of equal size. Also called Magen David
- Collins English Dictionary - Complete and Unabridged 2003 (at the Free Dictionary.com)
Star of David نجمة داوود - The hexagram formed by the intersection of two equilateral triangles, known today as the Star of David is the most prominent symbol of the state of Israel, and Judaism today, as can be seen on the flag of Israel.
- Star of David - Solomon's Seal, Baheyeldin.com