Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 49
because DAC is a right angle;and th<^ square of BC, by hypothesis, is equalto the squares of BA, AC; therefore, thesquare of DC is equal to the square of BC;and therefore also the side DC is equal to theside BC, And because the side DA is equa to AB, and AC commonto the two triangles DAC, BAC,… … ELSBZISNTS OF GEOMETRY. W^VWWXVWW^VWWWWVWVW BOOK ZI. DEFINITIONS.I. EVERY right angled parallelogram, or rectangle,, is said to becontained by any twool tbe straight lines which are about oneol the right angles. Thus the right angled parallelogram AC is called the rectangle contained by AD and DC,…
Euclid's Elements · Geometry · Trigonometry
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-87-132.webp)
