425411DE MAGNITUDINE TERRÆ
Problema XXIX.
Triangulum I O ?, Harlemum, Amſtelodamum
Alcmaria.
11 Alcmaria.
In Problemate XXVIII datur I O diſtantia inter Har- \\ lemum & Aſtelodamum # 4698, 4, 8.
Ex obſervatis autem angulus I O ? # 67 gr. 36`.
Angulus O I ? # 78 gr. 2`.
Angulus O ? I # 34 gr. 22`.
Unde per doctrinam Triangulorum dabitur O ? di- \\ ſtantia inter Amſtelodamum & Alcmariam # 8142, 5, 8.
Et I ? diſtantia inter Harlemum & Alcmariam # 7695, 4, 2.
Problema XXX.
Triangulum E O ? Leida, Amſtelodamum, Alcmaria.
22 In Problemate XXVI datur E O diſtantia inter Lei- \\ dam & Amſtelodamum # 9750, 0, 4.
Et in Problemate XXIX datur O ? diſtantia inter \\ Amſtelodamum & Alcmariam # 8142, 5, 8.
Ex obſervatione autem datur angulus I O ? # 67 gr. 36`.
Et angulus E O I # 43 gr. 18`.
Unde totus E O ? datur # 110 gr. 54`.
Hinc ope doctrinæ Triangulorum, datis cruribus & \\ angulo ab ipſis comprehenſo, datur baſis E ? diſtantia \\ inter Leidam & Alcmariam. # 14730, 5.
Angulus O E ? # 31 gr. 0, 30``.
Angulus E ? O # 38 gr. 5`, 30``.
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