Khan/khan-exercises — pull request #16645 by nphershm (2012-03-17 02:03:37+00:00)
Title: Adds exercise Triangle area 1

Exercise asks user to determine the area of a triangle placed on grid with no measurements.

Related Video:
http://www.khanacademy.org/math/geometry/basic-geometry/v/area-and-perimeter

Sandcastle:
http://sandcastle.khanacademy.org/media/castles/nphershm:area-tri/exercises/triangle_area.html