関連ワード:  in an isosceles triangle the base angles are equal and the vertex angle is twice    in an isosceles triangle the base angles are equal and the vertex    in an isosceles triangle the base angles are equal and the vertex angle is twice of each base angle    in an isosceles triangle the base angles are equal and the vertex angle is 80    in an isosceles triangle the base angles are equal and the vertex angle is 40  
結果 : in an isosceles triangle the base angles are equal and the vertex