Lessons on Form: Or, An Introduction to Geometry, as Given in a Pestalozzian School, Cheam, SurreyTaylor and Walton, 1837 - 215 páginas |
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Página vi
... eight triangular planes , he will be required to deter- mine from these data the number of edges which that solid has . He will reason thus : -Eight triangular faces have twenty - four sides ; two sides form one edge : therefore , as ...
... eight triangular planes , he will be required to deter- mine from these data the number of edges which that solid has . He will reason thus : -Eight triangular faces have twenty - four sides ; two sides form one edge : therefore , as ...
Página 6
... eight - sided face . M. - Imitate all these faces on your slates . Ex- amine the three - sided figure on your slates : in how many points do its three sides meet ? P. - In three points . M .- ( Draws a triangle upon the school - slate ) ...
... eight - sided face . M. - Imitate all these faces on your slates . Ex- amine the three - sided figure on your slates : in how many points do its three sides meet ? P. - In three points . M .- ( Draws a triangle upon the school - slate ) ...
Página 7
... eight - sided has eight angles . M. - Can you imagine a figure having nine , ten , eleven , etc. sides ? Describe them on your slates , and observe how many angles each figure has . P. - Every figure has as many angles as it has sides ...
... eight - sided has eight angles . M. - Can you imagine a figure having nine , ten , eleven , etc. sides ? Describe them on your slates , and observe how many angles each figure has . P. - Every figure has as many angles as it has sides ...
Página 8
... eight - sided face , an octagon ( from the Greek oкTw , eight , and ywvía , angle ) . And if this mode of expression be extended to faces which are bounded by many sides , they are called polygons , ( from the Greek woλus many , and ...
... eight - sided face , an octagon ( from the Greek oкTw , eight , and ywvía , angle ) . And if this mode of expression be extended to faces which are bounded by many sides , they are called polygons , ( from the Greek woλus many , and ...
Página 12
... eight plane equilateral and equiangular triangles . There are four plane angles about each of its solid angles . M. — The name of this solid is octahedron ( from the Greek OxT , eight , and dpa , a seat ) . Can you find out how many ...
... eight plane equilateral and equiangular triangles . There are four plane angles about each of its solid angles . M. — The name of this solid is octahedron ( from the Greek OxT , eight , and dpa , a seat ) . Can you find out how many ...
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Términos y frases comunes
a b and c d a c b a c d acute angles adjacent angle alternate angles angle a b c angle contained angles are equal angles equal base called centre chords circumference cut the circle demonstration diameter dodecahedron edges equal angles equal sides equilateral exterior angle greater inscribed interior and opposite isosceles triangle LESSON likewise lines a b lines be drawn M.-Compare M.-Demonstrate M.-Draw M.-Express M.-Hence M.-What M.-When obtuse angle octahedron opposite angles P.-Because P.-The angle parallelogram pentagon perpendicular plane angles plane faces point of contact pupils pyramid quadrilateral figure rectangle contained rhomb right angles semi-circumference similar triangles slates solid angles sphere square straight line joining tangent third side three angles trapezium triangle a b c triangles are equal truth twice the rectangle unequal whole line
Pasajes populares
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.
Página 219 - A very convenient class-book for junior students in' private schools. It is intended to convey, in clear and precise terms, general notions of all the principal divisions of Physical Science.