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Write a function `median_trapezium(base1, base2)` that calculates the median length of a trapezium given the lengths of its two parallel sides, `base1` and `base2`. The median of a trapezium is the average of the lengths of its two parallel sides. #### Function Signature ```python [main.nopy] def median_trapezium(base1: float, base2: float) -> float: ``` #### Input - `base1` (float): The length of the first parallel side. - `base2` (float): The length of the second parallel side. #### Output - (float): The median length of the trapezium. #### Example Usage ```python [main.nopy] median_trapezium(15, 25) # Returns 20.0 median_trapezium(10, 20) # Returns 15.0 median_trapezium(6, 9) # Returns 7.5 ```
def median_trapezium(base1: float, base2: float) -> float: """ Calculate the median length of a trapezium given the lengths of its two parallel sides. Args: base1 (float): The length of the first parallel side. base2 (float): The length of the second parallel side. Returns: float: The median length of the trapezium. """ # Calculate the median length # Replace the following line with your implementation pass