This is exactly what we need to say that AB is parallel to CD. 19. The figure below shows a quadrilateral ABCD with diagonal BD bisecting angle ADCWhich equation is true? Other names for quadrilateral include quadrangle (in analogy to triangle), tetragon (in analogy to pentagon, 5-sided polygon, and hexagon, 6-sided polygon), and 4-gon (in analogy to k-gons for arbitrary values of k).A quadrilateral with vertices , , and is sometimes denoted as . find the measure of ∠abc (geometry, college)? 8,075 results, page 4. D In the diagram below of parallelogram ABCD with diagonals AC and BD, the \angle ADB = 37\degree and the \angle DCB = 120\degree . in the diagram below of quadrilateral abcd ac is a diagonal that biscets