def celsius_to_fahrenheit(celsius):
    """Convert Celsius to Fahrenheit."""
    return (celsius * 9/5) + 32

def fahrenheit_to_celsius(fahrenheit):
    """Convert Fahrenheit to Celsius."""
    return (fahrenheit - 32) * 5/9

def meters_to_feet(meters):
    """Convert meters to feet."""
    return meters * 3.28084

def feet_to_meters(feet):
    """Convert feet to meters."""
    return feet / 3.28084