Khan/khan-exercises — Issue #12093: Quadrilateral angles - Wrong Angle Marked
Author: KhanBugz
Created: 2012-01-25 18:02:44+00:00
State: open
Labels: firefox, win7, wrong-or-unclear

The angle X in the figure is NOT the one that is supplementary to the 87 degree angle. The correct angle which is supplementary is the one bounded by the sides marked 5.7 and 3.3.

[quadrilateral_angles.html?seed=100&problem=trapezoid](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/quadrilateral_angles.html?seed=100&problem=trapezoid&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/quadrilateral_angles.html?seed=100&problem=trapezoid&debug&activity=%5B%5B%22hint-activity%22%2C%220%22%2C84%5D%2C%5B%22hint-activity%22%2C%220%22%2C88%5D%2C%5B%22hint-activity%22%2C%220%22%2C92%5D%2C%5B%22hint-activity%22%2C%220%22%2C94%5D%2C%5B%22hint-activity%22%2C%220%22%2C95%5D%5D)

[]

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1

MathJax is loaded, ready, queue length: 0