Elements of Geometry, Conic Sections, and Plane Trigonometry |
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Page 11
... equal . A scalenc triangle is one which has three un- equal sides . 16. A right - angled triangle is one which has a ... AC , AD , AE are diagonals . D A E F 19. An equilateral polygon is one which has all its sides equal . An ...
... equal . A scalenc triangle is one which has three un- equal sides . 16. A right - angled triangle is one which has a ... AC , AD , AE are diagonals . D A E F 19. An equilateral polygon is one which has all its sides equal . An ...
Page 14
... equal to the angle EGH . Take the four straight lines AC , CB , EG , GF , all equal tc each other ; then will the line AB be equal to the line EF ( Axiom 2 ) . Let the line EF be applied to the line AB so that the point E may be on A ...
... equal to the angle EGH . Take the four straight lines AC , CB , EG , GF , all equal tc each other ; then will the line AB be equal to the line EF ( Axiom 2 ) . Let the line EF be applied to the line AB so that the point E may be on A ...
Page 17
... equal to two right angles ( Prop . II . ) ; and the angles AED , DEB , which the straight line DE makes with the ... AC to DF , and also the angle A equal to the angle D ; then will the triangle ABC be equal to the triangle DEF B A CE F ...
... equal to two right angles ( Prop . II . ) ; and the angles AED , DEB , which the straight line DE makes with the ... AC to DF , and also the angle A equal to the angle D ; then will the triangle ABC be equal to the triangle DEF B A CE F ...
Page 18
... equal to them , viz . the angle ABC to the angle DEF , and the angle ACB to the an ge DFE . Therefore , if two ... AC are equal to the two sides DE , DF , each to each , and the angle A to the angle D. Therefore , if two riangles , & c ...
... equal to them , viz . the angle ABC to the angle DEF , and the angle ACB to the an ge DFE . Therefore , if two ... AC are equal to the two sides DE , DF , each to each , and the angle A to the angle D. Therefore , if two riangles , & c ...
Page 19
... AC and BC . For the same reason , BC is less than the sum of AB and AC ; and AC less than the sum of AB and BC ... equal to one another . Let ABC be an isosceles triangle , of which the side AB is equal to AC ; then will the angle B be ...
... AC and BC . For the same reason , BC is less than the sum of AB and AC ; and AC less than the sum of AB and BC ... equal to one another . Let ABC be an isosceles triangle , of which the side AB is equal to AC ; then will the angle B be ...
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Common terms and phrases
ABCD allel altitude angle ABC angle ACB angle BAC base bisected chord circle circumference cone convex surface cosine curve described diagonals diameter dicular divided draw ellipse equal angles equal to AC equiangular equilateral equivalent exterior angle figure foci four right angles frustum given angle given point greater hyperbola hypothenuse inscribed intersect Join latus rectum less Let ABC logarithm major axis mean proportional meet multiplied number of sides opposite ordinate parabola parallelogram parallelopiped pendicular perimeter perpen perpendicular plane MN principal vertex prism PROPOSITION pyramid quadrant radii radius ratio rectangle regular polygon right angles right angles Prop right-angled triangle Scholium secant segment side AC similar sine solid angle sphere spherical triangle square subtangent tang tangent THEOREM triangle ABC vertex vertices
Popular passages
Page 20 - The circumference of every circle is supposed to' be divided into 360 equal parts, called degrees ; each degree into 60 minutes, and each minute into 60 seconds. Degrees, minutes, and seconds are designated by the characters °, ', ". Thus 23° 14' 35" is read 23 degrees, 14 minutes, and 35 seconds.
Page 148 - The radius of a sphere, is a straight line drawn from the center to any point of the surface.
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 34 - ... therefore the angle ACB is equal to the angle CBD. And because the straight line BC meets the two straight lines AC, BD, and makes the alternate angles ACB, CBD equal to one another, AC is parallel to BD.
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 159 - 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 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.
Page 30 - 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 29 - If a straight line is perpendicular to one of two parallel lines, it is perpendicular to the other also.
Page 151 - But when a solid angle is formed by three plane angles, the sum of any two of them is greater than the third (Prop.