Khan/khan-exercises — Issue #11242: Quadrilateral angles - How do we know this is a trapezoid
Author: KhanBugz
Created: 2012-01-15 01:25:32+00:00
State: open
Labels: chrome, win7, wrong-or-unclear

Reporter: christilin@msn.com

Not clear from figure how we know it is a trapezoid. If we assume it is a trapezoid, the answer makes sense.

[quadrilateral_angles.html?seed=101&problem=trapezoid](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/quadrilateral_angles.html?seed=101&problem=trapezoid&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/quadrilateral_angles.html?seed=101&problem=trapezoid&debug&activity=%5B%5B%22correct-activity%22%2C%22%5C%2273%5C%22%22%2C29%5D%5D)

["73"]

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

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