Exercises on Euclid and in modern geometry for the use of schools, private students, and junior university students (1881)
McDowell, James L · Cambridge, Deighton, Bell, and Co. · leaf 49
are called supplemental when theirsum equals two right angles, and complemental when theirsum equals one right angle. 26. If huo triangles have two sides of the one respectivelyequal to two sides of the other, and the contained angles supple-mental, they are equal in area. Let the triangles ABC and… … 27.] AND IN MODERN GEOMETRY. 21 The angles AGB and DEF are eqnal to two right angles (hyp.),and AGB and ACG are equal to two right angles (I. 13), there-fore the angles ACG and DEF are equal, and the sides aboutthese angles are equal, therefore (I. 4) the triangles A CG and DEFare equal in all…
Geometry
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