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 13
... known , the number of its edges and solid angles can be ascertained there- from . LESSON V. M. - Is there another among these solids which is bounded by triangles ? What is their number ? It is therefore called icosahedron ( from the ...
... known , the number of its edges and solid angles can be ascertained there- from . LESSON V. M. - Is there another among these solids which is bounded by triangles ? What is their number ? It is therefore called icosahedron ( from the ...
Página 41
... known , its adjacent angle , likewise , may be known . M. - How , then , may you ascertain the AN INTRODUCTION TO GEOMETRY . 41.
... known , its adjacent angle , likewise , may be known . M. - How , then , may you ascertain the AN INTRODUCTION TO GEOMETRY . 41.
Página 42
... known angle from two right angles . M. - Compare each of the angles a b c and cbd with two right angles . a b C d P. - The angle a b c is equal to two right angles minus [ less ] the angle cb d . The angle cbd is equal to two right ...
... known angle from two right angles . M. - Compare each of the angles a b c and cbd with two right angles . a b C d P. - The angle a b c is equal to two right angles minus [ less ] the angle cb d . The angle cbd is equal to two right ...
Página 55
... known that , the exterior anglecde is not equal to the interior and opposite angle f a bd , what must be concluded ? b a C P. — That the lines ab and d c are not parallel . M. - Again , if it be known that the angles a ef and dfe are ...
... known that , the exterior anglecde is not equal to the interior and opposite angle f a bd , what must be concluded ? b a C P. — That the lines ab and d c are not parallel . M. - Again , if it be known that the angles a ef and dfe are ...
Página 56
... known a IC that the 2 interior angles f a efcfe are not equal to 2 rt . s , what must be / b d concluded ? P. - That the lines a b and c d are not parallel . M. - If the s , a eƒ + cfe , are not equal to 2 rt . Zs , what may they be ...
... known a IC that the 2 interior angles f a efcfe are not equal to 2 rt . s , what must be / b d concluded ? P. - That the lines a b and c d are not parallel . M. - If the s , a eƒ + cfe , are not equal to 2 rt . Zs , what may they be ...
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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.