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Cursus mathematicus. Mathematical sciences : in nine books : comprehending arithmetick, geometry, cosmography, astronomy, navigation, trigonometry, with the description, construction, and use of geometrical and nautical instruments: and the doctrine of triangles applied to practice in mensurations of all kinds: as in longimetria, planometria, military architecture, or taking of heights, distances &c. surveying of land, woods, roads, &c. fortification. And in navigation, dialling, &c. : all which are disposed in such method and order as they ought to be read and practised, by such as would attain to a competent proficiency in them by their own industry (1690)

Leybourn, William · printed for Thomas Basset, Benjamin Tooke, Thomas Sawbridge, Awnsham and John Churchill · leaf 396

An illustration from Cursus mathematicus. Mathematical sciences : in nine books : comprehending arithmetick, geometry, cosmography, astronomy, navigation, trigonometry, with the description, construction, and use of geometrical and nautical instruments: and the doctrine of triangles applied to practice in mensurations of all kinds: as in longimetria, planometria, military architecture, or taking of heights, distances &c. surveying of land, woods, roads, &c. fortification. And in navigation, dialling, &c. : all which are disposed in such method and order as they ought to be read and practised, by such as would attain to a competent proficiency in them by their own industry, 1690, leaf 396
j - Pq by the 47th of the fir fEutU Ergo Zq - ^ - Dq — : Cq - f - 2ZE by Interpretation - In the Obtuse Angled Triaugle C D A . Which was to be proved . Zq - = Aq - j - 2AE ~ | - Eq by the 4th Prop . And Zq - j - Pq — Aq - pzAE - j - Eq - s - Pq by Additit . * Proposition XIV . But Dq = E = Zq - j… … prehended by one of the Sides which are Æ - HXq = 7Zq by the fifth Proposition , 1 about the Acute Angle , ( on which a Per Æir ^ Zq — - ; Xq by Transposition . pendicular sadeth, ) and the Part which is But ^ Zq — ^ Xq — Pq by the 47th of the first Em * between the Perpendicular , and the Acute…

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