f'*4 DISSERTATIO
XV. Problema
Triangulum EIO. Leyda , Harlemum, Arnßelo -
damum.
Per Problema XII. datur E I distantia inter Lei-dam & Harlemum 7049. r.
Ex observatis autem angulus 0 E I ly gr. 11 fer.
Et angulus E O I • 43 gr- 18 fer.
Et angulus E IO 109 gr. zi fer.
Quare distantia O E inter Amstelodamum & Lei-dam dabitur 9687. 9.
Et O I distantia inter Amstelodamum & Harle-mum 4695. 6.
XVI. Problema
Triangulum IO T. Harlemum , Amstelodamum,
Alcmaria.
Per Problema 15 datur IO distantia inter Amste-lodamum & Harlemum - 4695. 6.
Ex observatis autem angulus IO T 67 gr. 36 fer.
Et angulus O 1 T 78 gr. i fer.
Et angulus O T 1 z4.gr. 2.2. fer.
Unde per doctrinam triangulorum dabitur O Tdistantia inter Amstelodamum & Alcmariam 8137. 5.
Et IT distantia inter Harlemum & Alcmariam 7690. 6.
XVII.