the two congruent trapeziums make a rectangle. The parallel sides are always on opposite sides of the trapezium. They are the same distance apart throughout their length.

Image caption, Angles in congruent shapes are equal ... EF ÷ BC = 6 ÷ 3 = 2. The sides DE and DF are three times the size AB and AC. DF ÷ AC = 12 ÷ 4 = 3. This means triangles ABC and DEF ...