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ERRÅTÀ for the first fix Books.
pr. 37. cor. 1. 1 2 for point A. r. point D.
Τ Η Ε
E L E M E N T S
E U C L I I D.
Book XI. ness.
angles with all the lines that touch it, and are drawn in the
one plain, drawn at right angles to the common section of the
contained under that line, and another right one drawn in
tained by the right lines drawn in both plains, to the same
X. Equal and similar solid figures are such as are contained by an equal number of similar and equal plains,
plains set upon one plain, and meeting at one point in the
opposite are equal, similar, and parallel ; and the other pa-
about its diameter, which remains fixed in the same pofi-
XV. The axis of a sphere is that fixed right line about which the semicircle revolves.
centre, and terminated on either lide by the superficies of the
revolving about one of the sides, containing the right angle,