An elementary treatise on geometry : simplified for beginners not versed in algebra (1833)
Grund, Francis J. (Francis Joseph), 1805-1863 · Boston : Carter, Hendee & Co. · leaf 29
l to eachother. Q. If the lines CD, AB,areperpendicular to each other,what remark can you make inrelation to the angles d, 6,€, a? A. That each of these artgles is a right angle. Q. And what is the sum ofall the angles, a, b, c, d, e, f,around the same point, equalto? A. To four right angles. / Q.… … GEOMETRY. 25 space, which is occupied by the four right angles, formedby the intersection of the two perpendiculars MN, OP. QUERY VI. If a triangle has one side, and the two adjacent angles,equal to one side and the ttoo adjacent angles of anothertriangle, each to each, what relation do these…
Geometry, Plane
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