Geometry From Mars

This is a picture from a Thirty Seconds to Mars concert. In the background, they have their logo, which is an example of an equilateral triangle and parallel lines cut by a transversal.

Equilateral Triangle:

Parallel Lines and Transversal:

Line FH is parallel to line EI and the transversals are AB and AC. This also demonstrates Theorem 3-2 (If two parallel lines are cut by a transversal, then alternate interior angles are congruent) and Theorem 3-3 (If two parallel lines are cut by a transversal, then same-side interior angles are supplementary) -- here [59.94 + 120.06 = 180; 60.59 + 119.41 = 180]. (~CS1)