Legend has it that the boeing 707 got its name from the frequent use of the values of sine and cosine of 45 degrees by the engineers working on it. The value of sin 45 = cos 45 = 0.707106. That's how the 707 got its name.
The later models were successively named 717,727,737,747, etc. thus we have the Boeing 747, strange, but true - probably!
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