Find the odd statement: Two lines are perpendicular to each other if they are, A. Adjacent sides of a rectangle. B. Diagonals of a rhombus. C. Hypotenuse and one side of a right-angle triangle. D. Adjacent sides of a square.

Adjacent sides of a rectangle and of a square meet at 90°, and the diagonals of a rhombus bisect each other at right angles. The hypotenuse of a right triangle is not perpendicular to either of the other sides (the right angle is between the two shorter sides), so C is the odd statement.