Lessons on Form: Or, An Introduction to Geometry, as Given in a Pestalozzian School, Cheam, SurreyTaylor and Walton, 1837 - 215 Seiten |
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Seite 80
... tri- a angle a b c , h let a bac ; а bac : draw the straight line a d , bisecting then , aba c , and a d is common to the two tri- angles , a d b and a d c , and the bad Lead : .. the third side b 80 LESSONS ON FORM , BEING.
... tri- a angle a b c , h let a bac ; а bac : draw the straight line a d , bisecting then , aba c , and a d is common to the two tri- angles , a d b and a d c , and the bad Lead : .. the third side b 80 LESSONS ON FORM , BEING.
Seite 81
... bisected , 1. The base is , likewise , bisected ; 2. The bisecting line is at right angles to the base . M. - The angle opposite to the base of an isosceles triangle is usually called the angle at the vertex . In an isosceles triangle ...
... bisected , 1. The base is , likewise , bisected ; 2. The bisecting line is at right angles to the base . M. - The angle opposite to the base of an isosceles triangle is usually called the angle at the vertex . In an isosceles triangle ...
Seite 82
... bisected by bd ; for a bbc , and and aded ( a c being bisected ) , bac Lbcd ; d .. the triangles a b d and c b d are equal in every respect . Hence abdcbd ; .abc , at the vertex , is bisected . M. - How are the equal angles of an ...
... bisected by bd ; for a bbc , and and aded ( a c being bisected ) , bac Lbcd ; d .. the triangles a b d and c b d are equal in every respect . Hence abdcbd ; .abc , at the vertex , is bisected . M. - How are the equal angles of an ...
Seite 87
... bisected , the straight line joining the vertical angle and the point of bisection bisects the vertical angle and stands at right angles [ is perpendicular to , ] to the base . 9. If a triangle be equilateral , it is likewise AN ...
... bisected , the straight line joining the vertical angle and the point of bisection bisects the vertical angle and stands at right angles [ is perpendicular to , ] to the base . 9. If a triangle be equilateral , it is likewise AN ...
Seite 105
... bisect each other . α b For , abcd , and abe Ldce , and bae Lcde ; d Aabe Acde , and be ce , and a e = de . Hence , the diagonals a d , cb bisect each other in the point e . M. - Mention some figures which are parallelograms . P. F 5 AN ...
... bisect each other . α b For , abcd , and abe Ldce , and bae Lcde ; d Aabe Acde , and be ce , and a e = de . Hence , the diagonals a d , cb bisect each other in the point e . M. - Mention some figures which are parallelograms . P. F 5 AN ...
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Häufige Begriffe und Wortgruppen
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
Beliebte Passagen
Seite 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.
Seite 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...
Seite 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.
Seite 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.