Answer:
KU = 8
Step-by-step explanation:
From the diagram
KU + UN = KN , that is
KU + 40 = 48 ( subtract 40 from both sides )
UN = 40
KN = 48
KU + UN = 48
KU + 40 = 48 {Subtract 40 from both sides}
KU = 48 -40
