The first six books of the Elements of Euclid, in which coloured diagrams and symbols are used instead of letters .. (1847)
Euclid, Byrne, Oliver · London, W. Pickering · leaf 149
F a right line ■—■——be a tangent to a circle,and from the point of con-tact a right line ———-be drawn cutting the circle, the angle I made by this line with the tangent is equal to the angle in the alter- ate fegment of the circle. … If the chord fhould pafs through the centre, it is evi-dent the angles are equal, for each of them is a right angle.(B. 3. prs. 16, 31.) But if not, draw from the point of contact, it muft pafs through the centre of thecircle, (B. 3. pr. 19.) w + f = zLJ = f (b. i.pr.32.) = (ax.). Again O =£Dk= +4…
Geometry
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