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 99
ed parallelogram, or rectangle, is said tobe contained by any two of the straight lines which containone of the right angles. Thus the rectangle ABCD is said to be contained by the straightlines AB and AD, or by the straight lines BA, BC, etc. We shall use the abbreviations *^the rectangle AB, BC,… … Thus the parallelogram HG, together with the complements AF,FC, is the gnomon, which is more briefly expressed by the lettersAGK, or EHC, which are at the opposite angles of the parallelogramswhich make the gnomon. Similarly, the figure consisting of EK together with the comple-ments AF, FC (that…
Euclid's Elements · Geometry · Mathematics, Greek
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