Higbee, F. G · New York, John Wiley & Sons · leaf 72
lves to nand the diagonal aBn revolves to ab. Since Ph is on thisdiagonal p, the required plan view of P will be found at thepoint where a perpendicular from Ph to rR intersects ab. Tofind the elevation of P draw first ab, a being on the G. L. since PROBLEMS ON ANGLES 6i A is on the trace rR, and b… … Fig. si. 52. Corollary. Given a line and a point to draw through thepoint a Hne making a given angle with the given line. Discussion. If a plane be passed through the given point andline it will be the plane of the required angle. If this plane berevolved into H or V the true relation of the point…
Geometry, Descriptive
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