最終更新日:2022/12/24

The ſide of a Hexagon or Radius being given, the ſide of a Decangle or ſubtenſe of 30 deg. is alſo given ; for by the 19 of the ſecond, the Semi-radius being deducted from the ſquare root of the ſquares of Radius and the half Radius added together, the remainer is the ſide of a Decangle.

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