Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 74
(19. 1.).The point H, therefore, is within theciv le, and therefore the str ight lineAG cute the circle. Cor. From this it is manifest, that thestraight line which is drawn at right an-gles to the diameter of a circle from theextremity of it, touches the circle ; andthat it touches it only in one… … To draw a straight line from a given point, eitherwithout or in the circumference, which shall touch a givencircle. First, Let A be a ^iven point without the given circle BCD; it isrequired to draw a straight line from A which shall touch the circle. Find (1. 3.) the centre E of the circle, and…
Euclid's Elements · Geometry · Trigonometry
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