I think this is correct but I'm not sure. Can someone check it for me?
>>54420
Looks right. Closed triangles always add up to 180 degrees and they give you two of the angles.
>>54420
the wording of c) is wrong, but perhaps you cant change it. It should read "The sum of the measures of the (angle)s of a (triangle) is 180°" otherwise it is correct.