Посчитать площади круга, прямоугольника, треугольника

def simple_areas(*args):
    if len(args) == 1: #The area of the circle
        args = 0.25 * 3.14 * (args[0])**2
        return ('{:.2f}'.format(args))
        
    elif len(args) == 2: #The area of the rectangle
        args = args[0] * args[1]
        return args
        
    elif len(args) == 3: #The area of the triangle
        if args[0] + args[1] > args[2] and args[1] + args[2] > args[0] and args[0] + args[2] > args[1]:
            args = 0.5*(args[0] * args[2])
            return args
        else:
            return 'The sum of lengths of two sides is less or equal the length of the third or is equal'
    else:
        return 0
 
if __name__ == '__main__':
    # These "asserts" using only for self-checking and not necessary for auto-testing
    def almost_equal(checked, correct, significant_digits=2):
        precision = 0.1 ** significant_digits
        return correct - precision < checked < correct + precision
 
    assert almost_equal(simple_areas(3), 7.07), "Circle"
    assert almost_equal(simple_areas(2, 2), 4), "Square"
    assert almost_equal(simple_areas(2, 3), 6), "Rectangle"
    assert almost_equal(simple_areas(3, 5, 4), 6), "Triangle"
    assert almost_equal(simple_areas(1.5, 2.5, 2), 1.5), "Small triangle"
 
    print("Earn cool rewards by using the 'Check' button!")