
    Design an algorithm to calculate the total visible display area of a cylindrical student progress tracker, excluding the top and bottom surfaces, where the tracker's width is determined by its radius and its vertical presentation space is defined by its height. The display surface will be used to visualize individual student performance data and learning progression across different subjects.
    

    
def lateralsuface_cylinder(r, h):
    """
    Design an algorithm to calculate the total visible display area of a cylindrical student progress tracker, excluding the top and bottom surfaces, where the tracker's width is determined by its radius and its vertical presentation space is defined by its height. The display surface will be used to visualize individual student performance data and learning progression across different subjects.
    

    """
def lateralsuface_cylinder(r, h):
    """
    Design an algorithm to calculate the total visible display area of a cylindrical student progress tracker, excluding the top and bottom surfaces, where the tracker's width is determined by its radius and its vertical presentation space is defined by its height. The display surface will be used to visualize individual student performance data and learning progression across different subjects.
    

    """
    lateralsurface = 2 * 3.1415 * r * h
    return lateralsurface