Aright triangle has

a) three sides with the same length
b) two sides that are parallel
c) at least two congruent sides
d) two sides that are perpendicular

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.

chad should not have included the values (1, 2) and (3, 6) because that would mean he only had half a healing card.