Because the relation is 9/5 C + 32 = F; if you let F = C you find the point they are the same:
-40F = -40C
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The point at which the Celsius and Fahrenheit scales meet is -40 degrees. -40 degrees Celsius is equal to -40 x 9 = -360 / 5 = -72 + 32 = -40 degrees Fahrenheit.
Because they do, it ws how each system was invented.
40 degrees fahrenheit 40 degrees celsius is way higher then it is fahrenheit.
40 degrees Celsius = 104 degrees Fahrenheit
40 degree Celsius = 104 degree Fahrenheit.