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 108
alf the sum of the sides by thesquare on half the base; and if a perpendicular be drawnfrom the point where the bisector of the external vertical anglemeets the base to either side, the rectangle under the interceptbetween the perpendicular and the vertex, and half thedifference of the sides is… … dicular to AF, DP to AE, EL to AB, and FT to AC. Then(112) AR is half the sum of the sides and AN is half their dif-ference. 80 EXERCISES ON EUCLID [116. Because the opposite angles ELR and EPR of the quadrilateralRLEP are right angles, therefore it is circumscribable by a circle,and therefore RA .…
Geometry
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