Shaw's Civil architecture; being a complete theoretical and practical system of building, containing the fundamental principles of the art (1852)
Shaw, Edward · Boston, J. P. Jewett · leaf 88
- ,i illl- llVlijcrliull o: a Straii^;il l.il:r li.nl ij|i.m ,1 t 1 lin.hif -siiil;i,c :,iii| |||(< melluiil i>tilr;iiviiio:i laimi-iil in mhIi .i rMijiiliiiii … y^ L.. L PRACTICAL GEOMETRY. 57 F A D is a right angle, the two planes are perpen-dicular. 2. (Fig. 2.) A line, A B, is perpendicular to a planeP Q, when the line A B is perpendicular to any lineB C, in the plane P Q, which passes through thepoint B, where the line meets the plane. The pointB is…
Architecture · Building
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