Question 387958
the strategy is:


given ___ median and altitude


median divides side into equal lengths


altitude is perpendicular


the median equals itself (reflection)


the two right angles from the perpendicular are equal


the two halves of the side divided by the median are equal (definition of median)


so the two internal triangles are congruent by SAS


the two sides of the larger triangle are congruent (CPCTC)


the large triangle is isosceles by definition