Elementary plane geometry : inductive and deductive / by Alfred Baker (1903)
Baker, Alfred, 1848-1942 · Toronto : Gage · leaf 15
tain 90°, and the anglesABD, DBC, .... are angles of 90°. A semicircle contains 180\ andthe straight angle ABC contains180°. A triangle: It has three sides and three angles. A quadrangle : It has four angles. Ha\ing four sides,it is also called a quadrilateral. A straight line joining two opposite… … 12 Geometry. Two straight lines which havethe same dii-ectiou are said to beparallel to oue another.
Geometry, Plane
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