関連ワード:  an obtuse angle triangle can be isosceles    an obtuse angle triangle can be equilateral    an obtuse angle triangle can or cannot be isosceles    an obtuse angle triangle can be an isosceles triangle true or false    an isosceles triangle can be an obtuse angle triangle also    an isosceles triangle can be an obtuse angle triangle also true or false    can an isosceles triangle be obtuse    is an isosceles triangle acute obtuse or right  
結果 : an obtuse angle triangle can be isosceles