An Elementary Geometry |
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Page 34
... equal altitudes as their bases . For in the proportion above , if B b , or A = a , the equals can be can- = celled from the second ratio ( Pn . 21 ) . THEOREM V. 14. The area of a trapezoid is equal to half the product of its altitude ...
... equal altitudes as their bases . For in the proportion above , if B b , or A = a , the equals can be can- = celled from the second ratio ( Pn . 21 ) . THEOREM V. 14. The area of a trapezoid is equal to half the product of its altitude ...
Page 37
... altitudes of two similar triangles are proportional to the homologous sides . Let BG and EH be the alti- tudes of ... equal to an angle of the other , and the sides including these angles proportional , are similar . In the triangles ABC ...
... altitudes of two similar triangles are proportional to the homologous sides . Let BG and EH be the alti- tudes of ... equal to an angle of the other , and the sides including these angles proportional , are similar . In the triangles ABC ...
Page 43
... equal , their altitudes are equal , that is , the bases are equidistant from the vertex 0 . 35. Scholium . O is called the centre , and the perpendicular OG the apothem of the polygon . 36. Corollary . In regular polygons of the same ...
... equal , their altitudes are equal , that is , the bases are equidistant from the vertex 0 . 35. Scholium . O is called the centre , and the perpendicular OG the apothem of the polygon . 36. Corollary . In regular polygons of the same ...
Page 45
... equal bases are to each other as their altitudes ; those having equal altitudes are as their bases . 44. Where must a line from the vertex be drawn to bisect a tri- angle ? ( 13. ) 45. Two or more lines parallel to the base of a ...
... equal bases are to each other as their altitudes ; those having equal altitudes are as their bases . 44. Where must a line from the vertex be drawn to bisect a tri- angle ? ( 13. ) 45. Two or more lines parallel to the base of a ...
Page 72
... equivalent , it is evident that in moving over an equal length of altitude the sections will move over equal volumes ; therefore , as the altitudes are equal , the prisms are equivalent . 20. Corollary . Any prism is therefore equivalent ...
... equivalent , it is evident that in moving over an equal length of altitude the sections will move over equal volumes ; therefore , as the altitudes are equal , the prisms are equivalent . 20. Corollary . Any prism is therefore equivalent ...
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Common terms and phrases
A B C ABCD adjacent altitude angle ABC apothem arcs A B base and altitude bisect centre chord circ circumference cone construct the triangle convex surface Corollary cube cylinder diagonals diameter distance divided dodecagon EATON'S equal altitudes equally distant equiangular equilateral feet frustum given angle given circle given line given point given side given square half the arc hexagon homologous sides hypothenuse included angle infinite number inscribed internal angles intersection isosceles triangle Let ABCDEF line joining lines A B measured by half number of sides opposite sides parallel planes parallelogram parallelopiped perimeter perpendicular plane parallel quadrilateral radii radius ratio rectangle regular polygon respectively equal rhombus right angles right prism right pyramid right triangle Scholium secant segment similar triangles slant height sphere tangent THEOREM VII trapezoid triangle ABC vertex
Popular passages
Page 25 - Four quantities are in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth.
Page 30 - If any number of quantities are proportional, any antecedent is to its consequent as the sum of all the antecedents is to the sum of all the consequents. Let a : b = c : d = e :f Now ab = ab (1) and by Theorem I.
Page 27 - If the product of two quantities is equal to the product of two others, the...
Page 43 - The area of a regular polygon is equal to half the product of its perimeter and apothem.
Page 11 - 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, the two triangles are equal in all respects.
Page 23 - If two triangles have two sides of one respectively equal to two sides of the other, but the third sides unequal...
Page 20 - ... polygon, is equal to twice as many right angles as the polygon has sides minus two.
Page 49 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.
Page 70 - A right cylinder is a solid described by the revolution of a rectangle about one of its sides.
Page 64 - DEFINITIONS. 1 . A straight line is perpendicular to a plane, when it is perpendicular to every straight line of the plane which it meets.