Elementary plane geometry : inductive and deductive / by Alfred Baker (1903)
Baker, Alfred, 1848-1942 · Toronto : Gage · leaf 20
he bevel to the angles CAB and CBA, com-pare their magnitudes. Compare also the sizes of these angles by accuratelycutting the triangle out of the paper, and placing thetriangle reversed in the vacant space left in the paper,so that the angle B rests in the space A. Compare also the sizes of these… … Construction of Teiangles. 17 In each case compare the magnitudes of the angles atthe base. The result of our observations is that the anglesat the base of an isosceles triangle are equal. Of course it would follow from this that all the anglesin an equilateral triangle aie equal, as we have…
Geometry, Plane
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