Review & Preview Jerry has an idea. Since he knows that an isosceles trapezoid has reflection symmetry, he reasons, “That means that it must have two pairs of angles with equal measure.” He marked this relationship on his diagram at right. ISOSCELES TRAPEZO Copy the shapes below onto your paper. Similarly, mark which angles must have equal measure due to reflection symmetry. b. C. d. A ISOSCELES TRIANGLE EQUILATERAL TRIANGLE RHOMBUS