- begin-aligned- 4 - - text - ABC is a triangle in which altitudes - mathrm - BD - text - and - mathrm - CE - text - to sides - mathrm - AC - text - and - mathrm - AB - text - are equal -see figure- Show that - text - -i- - - Delta mathrm - ABD - cong text - ACE - text - -i- - - mathrm - AB - - text - AC i-e- - mathrm - ABC - text - is an isosceles triangle- - - text - A - end-aligned- -

Question

- begin-aligned- 4 - - text - ABC is a triangle in which altitudes - mathrm - BD - text - and - mathrm - CE - text - to sides - mathrm - AC -  text - and - mathrm - AB - text - are equal -see figure- Show that -  text - -i- - - Delta mathrm - ABD - cong text - ACE -  text - -i- - - mathrm - AB - - text - AC i-e- - mathrm - ABC -  text - is an isosceles triangle- - - text - A - end-aligned- -

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