Answer:
The approximate temperature of the preheated oven is 204 °C.
Explanation:
Here, the given temperature in Fahrenheit = 400 °F
Let us assume the given temperature in Celsius = C
Now, the relation between the two measure of temperature is given as:

According to the question:
Or, C = 204.4°C
Hence, the approximate temperature of the preheated oven is 204 °C.