In triangle abc, m∠bac = 50°. if m∠acb = 30°, then the triangle is triangle. if m∠abc = 40°, then the triangle is triangle. if triangle abc is isosceles, and ab = 6 and bc = 4, then ac = .

Which of the following statements is not true? a.parallel lines are lines in the same plane that never intersect. b.congruent figures have the same shape and same size angles and sides. c.similar figures must have the same shape and the same size. d.a rotation is when you turn a figure around a certain point.