The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 355
rough a givenpoint P in the base BC. Let PE be the required straight line.Then area ABPE^half the A ABC.But, if D be the middle point of BC, A ADB = half the a ABC. [I. 38. yry / ^^ .-. ABPE-aADB..*. subtracting a ABP from each, we haveaAEP=aADP..-. AP, DE are parallel. [I. 39. Hence the…
Euclid's Elements · Geometry · Mathematics, Greek
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