Sum of all angles of a quadrilateral add upto 360∘.
∠A , ∠B and ∠C add upto 300∘.
Thus the value of ∠D should be 60∘.
Step 1: Draw AB = 3.5 cm.
Step 2: Draw ∠DAB=75∘,∠ABC=105∘ at B.
Step 3: Draw BC = 6.5 cm.
Step 4: At D draw ∠ADC=60∘.
Step 5: Extend the line and mark the point of intersection as C to get the quadrilateral ABCD.