Elements of geometry : containing books I to III (1886)
Smith, J. Hamblin · Toronto : W.J. Gage · leaf 116
ons ix., x., xi., xn. of Book I. give goodexamples of symmetrical constructions. Note 11. Euclids Proof of 1. 5. The, angles at the base of an isosceles triangle are equal to oneanother ; oml if the equal sides be produced, the angles upon theother side of the base shall be equal. Let ABC be an… … Then in As AFC, AGB, , V FA = GA, and AC=AB, and z FAC= l GAB, \ FC=GB, and z ^C= z AGB, and z J CF= z ABG. Again, v J.F=^(?, of which the parts AB, AC are equal,.. remainder BF=remainder CG. Then in as BFC, CGB,y BF=CG, and FC=GB, and z £^0= z CGB,.-. z .FBC= z (?C5, and z £Ci^= z CBG, Now it has…
Geometry
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