Three interior angles of a quadrilateral have measures of 100degree,120degree, and 80 degree. Find the fourth angle measure. The fourth angle measure is..

Complete each statement from the information given and the triangle criterion you used. if the triangles cannot be shown to be congruent, leave the box for the second triangle blank and choose for reason “cannot be determined.” carbon - regular hexagon. ∆can ≅ ∆ by