Elementary plane geometry : inductive and deductive / by Alfred Baker . in AD, BE, lines in the figure are bisected ? What triangles are isosceles ?What angles are right angles ? How many right-angled triangles arethere ? 18. Construct a triangle ABC (BC = 47, CA = 40, AB = 27 milli-metres). On the other side of BC construct DBC with DB = AC,and DC = AB ; on the other side of AC construct EAC with EC = AB,and EA = BC ; on the other side of AB construct FAB with FA = BC,and FB = AC. Join AD, BE, CF. What are the positions of DC,and CE with respect to each other ; also EA, AF ; and FB, B
Elementary plane geometry : inductive and deductive / by Alfred Baker . in AD, BE, lines in the figure are bisected ? What triangles are isosceles ?What angles are right angles ? How many right-angled triangles arethere ? 18. Construct a triangle ABC (BC = 47, CA = 40, AB = 27 milli-metres). On the other side of BC construct DBC with DB = AC,and DC = AB ; on the other side of AC construct EAC with EC = AB,and EA = BC ; on the other side of AB construct FAB with FA = BC,and FB = AC. Join AD, BE, CF. What are the positions of DC,and CE with respect to each other ; also EA, AF ; and FB, BD? What lines in the figure are bisected ? Has any line the thirdpart cut off? Has any line the sixth ? 19. If two sides of a triangle are unequal, the angles opposite tothem are unequal. (Suppose the angles equal and prove an ab-surdity.) 20. If two angles of a triangle are unequal, the sides opposite tothem are unequaL CHAPTER III. Equality of Triangles. 1. Constraet two triangles, each with sides of lengthsIJ, IJ and If inches, as indicated in the
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