∆abc has vertices at a(11, 6), b(5, 6), and c(5, 17). ∆xyz has vertices at x(-10, 5), y(-12, -2), and z(-4, 15). ∆mno has vertices at m(-9, -4), n(-3, -4), and o(-3, -15). ∆jkl has vertices at j(17, -2), k(12, -2), and l(12, 7). ∆pqr has vertices at p(12, 3), q(12, -2), and r(3, -2). can be shown to be congruent by a sequence of reflections and translations. can be shown to be congruent by a single rotation.