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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 394

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 394
us Mathematicus . 35 s Proposition VII . Proposition V . If a Right Line le divided at pleasure , the If a Right Line be divided into equal and Squares of the Whole Line and one of the unequal farts - , the Reft angle comprehen Segments together , are equal to twice the ded under the unequal… … For , If Z = A - f - E by Supposition , Then A — Z - \ - X by the tenth Æquation . 2 And E — Z — X by the 15th Æquation . 2 ' I Zi + ZX ZX — Xq » Then AE = Zg — Xq by Multiplication . a 4 If Z — A - j - E by Supposition , And AE - f - Xg = Zg by Transposition . ThenA = Z — E by Transposition . 4 4…

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