The perimeter of diamond ABCD is 16 cm, ∠ABC＝60° , the diagonal lines AC and BD intersects at point O . Find the length of AC and BD quadrilateral

Given the trapezoid ABCD, AD\parallel BC , AB=AD+BC , E is the midpoint of CD. Prove AE , BE bisects \angle DAB , \angle ABC respectively. quadrilateral

Given quadrilateral ABCD , AD \parallel BC , BD bisects ∠ADC ,CE bisects ∠BCD , intersects AB at point E , and intersects BD at point O Prove the distance from O to EB is equal to that from O to ED . quadrilateral