Essentials of Geometry |
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Page 4
... sides , not their length . 4. If there is but one angle at a point , it may ... number of angles , however , may be formed at a given point , and so have a ... sides and near the vertex , in which case the single letter sufficiently ...
... sides , not their length . 4. If there is but one angle at a point , it may ... number of angles , however , may be formed at a given point , and so have a ... sides and near the vertex , in which case the single letter sufficiently ...
Page 10
... sides of A B and on opposite sides of CD , are vertical ; likewise , c and d . Note . - Let the student see to it that he is able to give , in every instance , not only the number of the reference , but the reference itself , and that ...
... sides of A B and on opposite sides of CD , are vertical ; likewise , c and d . Note . - Let the student see to it that he is able to give , in every instance , not only the number of the reference , but the reference itself , and that ...
Page 43
... sides , seven triangles for n sides , n triangles ; that is , the number of triangles E A D ; B the number of sides . Now , the value of the angles of one triangle is 2 R ( Th . XII ) ; of two triangles , twice 2R ; of three triangles ...
... sides , seven triangles for n sides , n triangles ; that is , the number of triangles E A D ; B the number of sides . Now , the value of the angles of one triangle is 2 R ( Th . XII ) ; of two triangles , twice 2R ; of three triangles ...
Page 79
... number of times that either of the given sides contains the unit of length , which may be assumed at pleasure . 8. If two of the opposite sides were 15 each , and the other two were 10 each , what would be the form of the figure ? Would ...
... number of times that either of the given sides contains the unit of length , which may be assumed at pleasure . 8. If two of the opposite sides were 15 each , and the other two were 10 each , what would be the form of the figure ? Would ...
Page 107
... number of linear units in the base multiplied by the number of linear units in the altitude . - Q. E. D. Cor . The area of a square is equal to the second power of one of its sides . For , in this case , the base and the altitude are ...
... number of linear units in the base multiplied by the number of linear units in the altitude . - Q. E. D. Cor . The area of a square is equal to the second power of one of its sides . For , in this case , the base and the altitude are ...
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Common terms and phrases
A B and C D ABCD adjacent angles angle equal apothem bisect central angles centre circle whose radius circumference coincide construct convex surface cylinder diagonals diameter distance divided draw drawn equal altitudes equal bases equal circles equally distant equiangular EXERCISES feet frustum generatrix given angle given circle given line given point greater Hence homologous sides hypotenuse included angle inscribed angle inscribed circle interior angles intersect isosceles triangle lune number of sides oblique parallel parallelogram parallelopiped perimeter perpendicular plane prism Prob proportional pyramid Q. E. D. Cor Q. E. F quadrilateral QUERIES radii ratio rectangle regular polygon right cone right triangle Scholium secant segments similar slant height sphere spherical triangle square straight line tangent triangle A B C vertex vertices
Popular passages
Page 18 - if two triangles have two sides of the one equal to two sides of the...
Page 110 - In any triangle the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides diminished by twice the product of one of those sides and the projection of the other upon it.
Page 13 - If two triangles have two angles and the included side of the one, equal to two angles and the included side of the other, each to each, the two triangles will be equal.
Page 107 - If two triangles have two sides and the included angle of the one equal to two sides and the included angle of the other, each to each, they are equal in all their parts.
Page 24 - 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.
Page 38 - If two sides of a quadrilateral are equal and parallel, the figure is a parallelogram.
Page 42 - If the product of two quantities is equal to the product of two others, two of them may be made the means, and the other two the extremes of a proportion. Let bc=ad.
Page 232 - In any spherical triangle, the greater side is opposite the greater angle ; and conversely, the greater angle is opposite the greater side.
Page 14 - In an isosceles triangle the angles opposite the equal sides are equal.
Page x - AXIOM is a self-evident truth ; such as, — 1. Things which are equal to the same thing, are equal to each other. 2. If equals be added to equals, the sums will be equal. 3. If equals be taken from equals, the remainders will be equal. 4. If equals be added to unequals, the sums will be unequal.