A heatable composite pane having a trapezoidal outline, including a heating area having heating wires embedded in the composite and at least two main busbars. The two main busbars connect ends of a first group of parallel heating wires electrically in parallel. The outer triangular surface of the trapezoidal outline includes at least a second group and a third group of parallel heating wires that can be fed electrically via busbars. The second group and the third group of heating wires have different lengths and are combined to be connected in parallel with the first group. The second group and the third group are electrically connected to one another in series such that an effective wire length between the two main busbars is increased to homogenize heating power in the triangular surface with heating power in the heating area.