Elements of Geometry and Conic Sections |
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Page 114
... plane in which these lines are . Let the straight line AB be perpen- dicular to each of the straight lines CD , EF which intersect at B ; AB will also be perpendicular to the plane MN M which passes through these lines . Through B draw ...
... plane in which these lines are . Let the straight line AB be perpen- dicular to each of the straight lines CD , EF which intersect at B ; AB will also be perpendicular to the plane MN M which passes through these lines . Through B draw ...
Page 115
... plane MN . Cor . 2. Through a given point B in a plane , only one per- pendicular can be drawn to this plane . For , if there could be two perpendiculars , suppose a plane to pass through them , whose intersection with the plane MN is ...
... plane MN . Cor . 2. Through a given point B in a plane , only one per- pendicular can be drawn to this plane . For , if there could be two perpendiculars , suppose a plane to pass through them , whose intersection with the plane MN is ...
Page 116
... plane MN . All the lines AC , AD , AE , & c . , which are equally distant from the perpendicular , have the same inclination to the plane ; because all the angles ACB , ADB ... MN . For in the plane MN , draw CD through the 116 GEOMETRY .
... plane MN . All the lines AC , AD , AE , & c . , which are equally distant from the perpendicular , have the same inclination to the plane ; because all the angles ACB , ADB ... MN . For in the plane MN , draw CD through the 116 GEOMETRY .
Page 117
Elias Loomis. For in the plane MN , draw CD through the point B perpendicular to EF . Then , because the planes AE ... plane MN , draw. BOOK VII . 117.
Elias Loomis. For in the plane MN , draw CD through the point B perpendicular to EF . Then , because the planes AE ... plane MN , draw. BOOK VII . 117.
Page 118
Elias Loomis. M E F D In the plane MN , draw the straight line BD joining the points B and D. Through the lines AB , BD pass the plane EF ; it will be perpendicular to the plane MN ( Prop . VI . ) ; also , the line CD will lie in this plane ...
Elias Loomis. M E F D In the plane MN , draw the straight line BD joining the points B and D. Through the lines AB , BD pass the plane EF ; it will be perpendicular to the plane MN ( Prop . VI . ) ; also , the line CD will lie in this plane ...
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Common terms and phrases
ABCD AC is equal allel altitude angle ABC angle ACB angle BAC base BCDEF bisected chord circle circumference cone convex surface curve described diagonals diameter draw ellipse equal angles equal to AC equally distant equiangular equilateral equivalent exterior angle foci four right angles frustum given angle given point greater hyperbola hypothenuse inscribed intersect join latus rectum Let ABC lines AC Loomis major axis mean proportional measured by half meet number of sides ordinate parabola parallelogram parallelopiped pendicular perimeter perpen perpendicular plane MN prism Professor of Mathematics PROPOSITION pyramid radii radius ratio rectangle regular polygon right angles Prop Scholium segment side AC similar similar triangles slant height solid angle sphere spherical triangle square subtangent tangent THEOREM triangle ABC vertex vertices
Popular passages
Page 60 - Any two rectangles are to each other as the products of their bases by their altitudes.
Page 17 - 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 will be equal, their third sides will be equal, and their other angles will be equal, each to each.
Page 101 - When you have proved that the three angles of every triangle are equal to two right angles...
Page 63 - IF a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the' rectangle contained by the parts.
Page 18 - BC common to the two triangles, which is adjacent to their equal angles ; therefore their other sides shall be equal, each to each, and the third angle of the one to the third angle of the other, (26.
Page 10 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Page 32 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 37 - Proportional, when the ratio of the first to the second is equal to the ratio of the second to the third.
Page 15 - Wherefore, when a straight line, &c. QED PROP. XIV. THEOR. If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.
Page 44 - 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.