Because they do, it ws how each system was invented.
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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.
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.
-40 degrees Celsius is equal to -40 degrees Fahrenheit.