関連ワード:  how to make obtuse angle triangle    how to draw obtuse angle triangle    how to draw obtuse angle triangle bisector    how to draw obtuse angle triangle with compass    how to draw obtuse angle isosceles triangle    how to draw altitude of obtuse angle triangle    how to draw medians of obtuse angle triangle    how to draw orthocentre of obtuse angle triangle    how to draw perpendicular bisector of obtuse angle triangle    how to get triangle angle