Khan/khan-exercises — Issue #6626: Congruent triangles 2 - isosceles triangle with different base angles
Author: KhanBugz
Created: 2011-11-18 15:01:13+00:00
State: open
Labels: firefox, vista, wrong-or-unclear

Triangle CAB has two sides AC and AB of length 4.3. Therefore the triangle is isosceles, and the base angles are equal. But the image states the base angles are different (angle ABC = 70 degrees, while angle ACB = 69 degrees). This is wrong. The solution (angle AED) as per hints is 69 degrees, which can only be correct if the angle ABC is also 69 degrees.

[congruent_triangles_2.html?seed=139&problem=opposite](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/congruent_triangles_2.html?seed=139&problem=opposite&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/congruent_triangles_2.html?seed=139&problem=opposite&debug&activity=%5B%5B%22hint-activity%22%2C%220%22%2C384%5D%2C%5B%22hint-activity%22%2C%220%22%2C391%5D%2C%5B%22hint-activity%22%2C%220%22%2C395%5D%2C%5B%22hint-activity%22%2C%220%22%2C399%5D%2C%5B%22hint-activity%22%2C%220%22%2C417%5D%5D)

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Mozilla/5.0 (Windows NT 6.0; rv:8.0) Gecko/20100101 Firefox/8.0

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