. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. 104 PRACTICAL MATHEMATICS But it will be noticed that the left member of this equation the three angles of the triangle ABC and that the right mem-ber includes all of the angles about the point C on one side of theline B E, which have already been found to equal two right , if DCE + ACT) + ACB = two right anglesthen ABC + BAC + ACB = two right anglesTherefore the sum of all the angles of
. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. 104 PRACTICAL MATHEMATICS But it will be noticed that the left member of this equation the three angles of the triangle ABC and that the right mem-ber includes all of the angles about the point C on one side of theline B E, which have already been found to equal two right , if DCE + ACT) + ACB = two right anglesthen ABC + BAC + ACB = two right anglesTherefore the sum of all the angles of any triangle is equal to tworight angles. (c) Laiv of the right triangle. If in the right triangle ABC, , the side A B is made 3 inches long, and the side A C is made fourinches long, then the side B C, called the hypotenuse, is found to be 5inches long. The proof of this may be found by considering the accompanyingfigure. The square ABED constructed on the side A B contains.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmathematics, bookyear
