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The Tangents of the Bafes are proportional to the Tangents of the Angle at the Vertex.
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by Henry Wilson - 1761 - 528 pages

## A Treatise of Trigonometry, Plane and Spherical ...: As Likewise a Treatise ...

Samuel Heynes - Trigonometry - 1716 - 132 pages
...the fourth . Lemma, the Co-fines of two Arcs are reciprocally proportional to their Secants. RULE V. The Tangents of the Bafes are proportional to the Tangents of the Angle at the Vertex. Hate V. /Tpjrviii. For by the fecund Axiom, T,ZBPA.T,BA(::RS,PA)::T>DPA.T,DA....

## Trigonometry Improv'd, and Projection of the Sphere, Made Easy: Teaching the ...

Henry Wilson - Sphere - 1720 - 192 pages
...The Tangents of the Sides, are reciprocally proportional to the Co-fines of the Vertical Angles. 9. The Tangents of the Bafes, are proportional to the Tangents of the Vertical Angles. 10. Having let fall the'Perpendicular, as before, it will be as the Sine of the Sum of the Hipothenufes,...

## A Treatise of Trigonometry, Plane and Spherical, Theoretical and Practical ...

Samuel Heynes - Trigonometry - 1725 - 132 pages
...the fourth Lemma, the Co-fines of two Arcs are reciprocally proportional to their Secants. RULE V. The Tangents of the Bafes are proportional to the Tangents of the Angle at the Vertex. Kate V. fig. XV III. For by the fécond Axiom. Т.. .¿БРА : T.BA(: :R:S.PA):...