metry 23 Hanna Anguiano CA Geometry B Illuminate Credit 1 pdf According to Theorem 2 label the parallelogram with the appropriate tick marks IIf 1 According to Theorem 3 label the parallelogram appropriately I B If then the quadrilateral is a parallelogram B 00 Regist C According to Theorem 4 label the parallelogram with the appropriate tick marks then the quadrilateral is a parallelogram then the quadrilateral is a parallelogram 1