Step-by-step explanation:
The answer to the question above is provided in the attached graph sheet.
Perpendicular lines are formed when two straight lines meet to make angle 90°. From the diagram in the graph sheet, the diagonal lines (two straight lines) of the kite cut across each other such that the lines form 4 right-angled triangles which have angles of 90°.
Hence, the diagonals of kite DEFG are perpendicular lines.