The book Elementary Synthetic Geometry was written by author George Bruce Halsted Here you can read free online of Elementary Synthetic Geometry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elementary Synthetic Geometry a good or bad book?
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[c] Its diagonals are equal, and bisect each other, 296. Inversely, a quadrilateral with [«], [If], or \c] is a rectangle.
297. A symtral deltoid is called a square.
298. A square has symcentry, and so has a rhombus and a rectangle.
299. A quadrilateral with [i] and [<«], or [2] ^nd [p], or [3] and [c], is a square.
CHAPTER XV.
CONGRUENCE OF TRIANGLES.
300. Theorem, Triangles are congruent if they have a side and two angles adjacent to it equal ; or a side and two angles, .
Fig. J47.
one adjacent and one opposite to it, respectively equal ; or two sides and the included angle equal, or two sides and the angle opposite the greater equal, or three sides equal.
Proof. Since in any triangle the sum of the three angles is a straight angle, the second case comes under the first. In every case, slide the two triangles in the plane until a pair of equal sides coincide, but beyond this common side are no coin- cident points. If then a pair of equal angles have a common vertex, or a second pair of equal sides have a common end point, the triangles are symmetrical with regard to the commort side.
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