Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 244
hey present any difficulties that call fordiscussion. In schools where there is a little time fortrigonometry, teachers sometimes find it helpful to beginsuch work at this time, since all of the trigonometricfunctions depend upon the properties of similar trian-gles, and a brief explanation of the… … 234 THE TEACHING OF GEOMETRY It is a mistaken idea that geometry is a prerequisiteto trigonometry. We can get along very well in teach-ing trigonometry if we have three propositions: (1) theone about the sum of the angles of a triangle; (2) thePythagorean Theorem ; (3) the one that asserts that…
Geometry
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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-65-96.webp)
![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep02muss-70-17.webp)
