| Условие | |||
| \(\triangle GHL\) — равнобедренный, GH и LH — боковые стороны | GM, LN — | ||
| \(\angle HGL = \angle\) HLG | HL = GH | HM = HN; LN = GM | |
| \(\Rightarrow\) | |||
| GN = LM | |||
| \(\Rightarrow\) | |||
| __ — общая сторона \(\triangle GML\) и \(\triangle LNG\) | |||
| \(\Rightarrow\) | |||
| \(\triangle GML = \triangle\) LNG | \(\Rightarrow\) GM = LN | ||
| Заключение | |||