Elementary plane geometry : inductive and deductive / by Alfred Baker (1903)
Baker, Alfred, 1848-1942 · Toronto : Gage · leaf 29
hiough the angle B, to the positionBM. The pencil has rotated through all the angles of thetriangle. But in its final position BM it points in adirection just opposite to its first position DC, andtherefore must have rotated through 180°. Hence allthe angles of this (which is any) triangle… … 26 Geometry. 5. Construct two tiiangles, ABC, DEF, each with baseIJ inch, and angles at the base 79 and 57.
Geometry, Plane
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