関連ワード:  which triangle has one obtuse angle    which triangle has an obtuse angle    which triangle is an obtuse angle    which type of triangle has one obtuse angle    which of these triangles has one obtuse angle    which is a triangle with one obtuse angle    a triangle has one obtuse angle true or false    triangle with one obtuse angle and no congruent sides    triangle having one obtuse angle    triangle with one obtuse angle and two congruent sides