Manning, Henry Parker, 1859- · Boston, U.S.A., Ginn & Company · leaf 82
METRY 71 with the axis of as. From the right triangle formed with thisperpendicular and p we have tan ip cos (0 — a) = tan ip. This is the polar equation of the line. We get the equationin x and y by expanding and substituting; namely, cos a tan ix + sin a tan iy = tan ip. The equation a tan ix + b… … 4. The distance, 8, of a point from a line : Let the radius vector to the point intersect the line at A,and let px be the radius vector to A. We have two right 72 NON-EUCLIDEAN GEOMETRY triangles with equal angles at A, and from the expressionsfor the sines of these angles we get the equation siniS…
Geometry, Non-Euclidean
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