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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.

Copy the shapes below onto your paper. Similarly, mark which angles must have equal measure due to reflection symmetry.

Draw all lines of symmetry.

Mark the angles that correspond and are on opposite sides of the line of reflection.