Licks, H. E · New York, D. Van Nostrand company · leaf 67
58 RECREATIONS IN MATHEMATICS 85 The three following propositions are certainly interesting. Are they true or false? (i) Let AB be a straight line and C any point on it. On AC and BC as bases construct the isosceles triangles AbC and BaC so that the equal sides make angles of 300 with the bases.… … broken lines. Then each of the angles of the triangle abc is 6o°. (2) Let ABC be any triangle. On the sides as bases construct the isosceles triangles AcB, BcA, CbA, so that the equal sides of each make angles of 300 with its base. Draw, ah, be, ca, as shown by the broken lines. Then each of the…
Mathematical recreations
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