Higbee, F. G · New York, John Wiley & Sons · leaf 90
Article 54 findthe intersection of R and S, and R and T. This is OP in the firstcase and OQ in the second, and POQ is the required angle. Itstrue size, pOnq, may be found by Article 50. 69. Special Cases, i. Find the angle a plane makes with HandV. PROBLEMS ON POINTS, LINES, AND PLANES 79 2. Find… … Discussion. The vertex of the given angle will he on the giventrace and the angle will lie in a plane perpendicular to the giventrace. This angle may, therefore, be constructed and since one 8o ESSENTIALS OF DESCRIPTIVE GEOMETRY side of it lies in the required plane the piercing point of this…
Geometry, Descriptive
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