Lessons on Form: Or, An Introduction to Geometry, as Given in a Pestalozzian School, Cheam, Surrey
Taylor and Walton, 1837 - 215 páginas
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a b and c d acute angles added alternate angle a b c angles are equal base bisected bounded called centre chords circle circumference coincide concluded curved demonstration describe diagonal diameters discover double draw drawn edges eight equal equal angles equilateral exterior angle extremities faces fall figure formed four given greater Greek Hence interior join known less LESSON likewise lines a b M.-Hence M.-What master meet object observe obtuse angle opposite angles P.-The angle P.-They parallel lines parallelogram passes plane angles prism produced pupils pyramid quadrilateral figure rectangle remaining respecting right angles sides similar slates solid angles sphere square straight line subtending surface tangent third triangle triangle a b c truth twice unequal vertical whole writing
Página 98 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Página 134 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square on the side subtending the obtuse angle, is greater than the squares on the sides containing the obtuse angle, by twice the rectangle contained by the side...
Página 137 - In every triangle, the square of the side subtending either of the acute angles is less than the squares of the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the perpendicular let fall upon it from the opposite angle, and the acute angle.