Khan/khan-exercises — Issue #11624: Quadrilateral angles - Question assumes a quadrilateral is a trapezoid without proving it
Author: KhanBugz
Created: 2012-01-19 19:00:50+00:00
State: open
Labels: chrome, win7, wrong-or-unclear

Reporter: galaxiaguy@gmail.com

A question contains a quadrilateral with the lengths of all four sides given along with a single angle. The question asks for the value of an angle adjacent to the known angle. The first hint says "This figure is a trapezoid". Proving the shape is a trapezoid from the information given seems beyond the level of the questions.

[quadrilateral_angles.html?seed=43&problem=trapezoid](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/quadrilateral_angles.html?seed=43&problem=trapezoid&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/quadrilateral_angles.html?seed=43&problem=trapezoid&debug&activity=%5B%5B%22hint-activity%22%2C%220%22%2C38%5D%5D)

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Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.18 (KHTML, like Gecko) Chrome/18.0.1010.1 Safari/535.18

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