Euclid, book i., propositions i. to xxvi., with exercises and alternative proofs [by T. Dalton].

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الصفحة 39 - IF two triangles have two sides of the one equal to two sides of the...
الصفحة 25 - To draw a straight line at right angles to a given straight line, from a given point in the same.
الصفحة 4 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
الصفحة 7 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
الصفحة 7 - Notions 1. Things which are equal to the same thing are also equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be subtracted from equals, the remainders are equal. 4. Things which coincide with one another are equal to one another.
الصفحة 36 - If, from the ends of the side of a triangle, there be drawn two straight lines to a point within the triangle, these shall be less than, the other two sides of the triangle, but shall contain a greater angle.
الصفحة 37 - ... shall be equal to three given straight lines, but any two whatever of these must be greater than the third.
الصفحة 18 - Upon the same base, and on the same side of it, there cannot be two triangles that have their sides which are terminated in one extremity of' the base, equal to one another, and likewise those which are terminated in the other extremity.
الصفحة 29 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line. At the point B in the straight line AB, let the two straight lines...
الصفحة 3 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.

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