To find missing measures when H is the circumcenter of quadrilateral ABCD, we would need additional information about the quadrilateral, such as angles, side lengths, or specific properties of the circumcenter.
The circumcenter is the point where the perpendicular bisectors of the sides of a polygon intersect. It is equidistant from the vertices of the polygon. To determine missing measures, we typically need more specific details about the shape or measurements within the quadrilateral or additional information about angles, side lengths, or relationships among the vertices or sides of the quadrilateral.