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" The straight line which bisects the vertical angle of an isosceles triangle is perpendicular to the base. "
Carpentry Made Easy, Or, The Science and Art of Framing, on a New and ... - Σελίδα 32
των William E. Bell - 1859 - 134 σελίδες
Πλήρης προβολή - Σχετικά με αυτό το βιβλίο

A pocket encyclopædia, or library of general knowledge

Edward Augustus Kendall - 1811 - 458 σελίδες
...exactly coincided with the triangle ABD in all its parts. The corollaries to this theorem are : (1.) That the line which bisects the vertical angle of an isosceles triangle, bisects the base, and is perpendicular to it. (2.) That every equilateral triangle is likewise equiangular,...

Pocket Encyclopedia: Or, A Dictionary of Arts, Sciences, and Polite ..., Τόμος 3

Edward Augustus Kendall - 1811 - 516 σελίδες
...exactly coincided with the triangle ABD in all its parts. The corollaries to this theorem are : (1.) That the line which bisects the vertical angle of an isosceles triangle, bisects the base, and is perpendicular to it. (3.) That every equilateral triangle is likewise equiangular....

Carpentry Made Easy: Or, The Science and Art of Framing, on a New and ...

William E. Bell - 1857 - 250 σελίδες
...at C and the two adjacent tides equal Hence, angle A= B. (Prop. IX., Cor.) Cor. 1. Every equilateral triangle is also equiangular. Cor. 2. The equality...angles of a triangle are equal, the sides opposite them are also equal, and the triangle is isosceles. Let the angle A=B, then will the sides AC and BC...

Gradations in Euclid : books i. and ii., with an explanatory preface [&c ...

Euclides - 1858 - 248 σελίδες
...CA is equal to CB, CD common, and LA CD equal L BCD; therefore by P. 4, / CAD equals L CBD.: 3. Also that the line which bisects the vertical angle of an isosceles triangle, bisects the base perpendicularly ; for AC equalling BC, DC being common, and / ACD by construction...

Elements of Geometry, Conic Sections, and Plane Trigonometry

Elias Loomis - 1877 - 458 σελίδες
...the axis XY when its vertices, taken two and two, are placed symmetrically with respect to that axis. The line which bisects the vertical angle of an isosceles triangle is an axis of symmetry with respect to the two parts of the triangle ; the line which bisects an angle...

Education, Τόμος 43

1923 - 718 σελίδες
...SUMMARY. 128. State five methods of proving lines perpendicular. 129. EXERCISES. 1. The bisector of the vertical angle of an isosceles triangle is perpendicular to the base, etc. The general methods of attack are placed at the beginning in heavy type for emphasis, and particular...

Essentials of Geometry

Alfred Hix Welsh - 1883 - 326 σελίδες
...same reason, (2) A = C: combining (1) and (2) we have (3) A = B Ax. 1. .-. (4) A = B = C. Cor. II.— The line which bisects the vertical angle of an isosceles triangle, is perpendicular to t/ie base at its middle point. Cor. III.—The perpendicular from the vertex of an isosceles triangle...

The elements of plane geometry, Τόμος 1

Mathematical association - 1884 - 146 σελίδες
...angle of an isosceles triangle is equidistant from the extremities of the base. Ex. 6. The straight line which bisects the vertical angle of an isosceles triangle is perpendicular to the base. Ex. 7. Any point D is taken on the bisector of an angle BAC ; prove that, if AB is equal to AC, then...

The Elements of Plane Geometry ...

Association for the improvement of geometrical teaching - 1884 - 150 σελίδες
...angle of an isosceles triangle is equidistant from the extremities of the base. Ex. 6. The straight line which bisects the vertical angle of an isosceles triangle is perpendicular to the base. Ex. 7. Any point D is taken on the bisector of an angle BAC ; prove that, if AB is equal to AC, then...

The text of Euclid's geometry, book 1, uniformly and systematically arranged ...

Euclides - 1884 - 214 σελίδες
...The bisector of the vertical angle of an isosceles triangle bisects the base. (96) The bisector of the vertical angle of an isosceles triangle is perpendicular to the base. (97) The opposite angles of a rhombus are equal. (98) A diagonal of a rhombus is a bisector of two...




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