A Syllabus of Modern Plane Geometry |
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Page 6
... ( the ALTITUDES ) meet in a point ( the ORTHOCENTRE ) . 6 The lines joining the angular points of a triangle to the points where the incircle touches the sides are concurrent . 7 If a transversal meet the sides BC , CA 6 A SYLLABUS OF.
... ( the ALTITUDES ) meet in a point ( the ORTHOCENTRE ) . 6 The lines joining the angular points of a triangle to the points where the incircle touches the sides are concurrent . 7 If a transversal meet the sides BC , CA 6 A SYLLABUS OF.
Page 7
... orthocentre respectively ; O , the circumcentre , N , the nine - point centre ; I , I1 , 12 , 13 , the incentre and excentres respectively ; X , Y , Z , the points where the incircle , and X , Y , Z , the points where the excircle ...
... orthocentre respectively ; O , the circumcentre , N , the nine - point centre ; I , I1 , 12 , 13 , the incentre and excentres respectively ; X , Y , Z , the points where the incircle , and X , Y , Z , the points where the excircle ...
Page 8
... orthocentre of the triangle formed by joining the other three . 20 Angle BHF = CHE - CAB ; Angle CHDAHF = ABC : Angle AHE = BHD = BCA . 21 The triangles AEF , DBF , DEC are similar to ABC . 22 AI , BI , CI , bisect the angles OAH , OBH ...
... orthocentre of the triangle formed by joining the other three . 20 Angle BHF = CHE - CAB ; Angle CHDAHF = ABC : Angle AHE = BHD = BCA . 21 The triangles AEF , DBF , DEC are similar to ABC . 22 AI , BI , CI , bisect the angles OAH , OBH ...
Page 18
... orthocentre of the triangle , and its radius is a mean proportional between HA and HD ( see Notation of Sect . II . ) . NOTE . - In order that there may be such a circle , the ortho- centre must be external to the triangle , that is the ...
... orthocentre of the triangle , and its radius is a mean proportional between HA and HD ( see Notation of Sect . II . ) . NOTE . - In order that there may be such a circle , the ortho- centre must be external to the triangle , that is the ...
Common terms and phrases
ABCD angular points antiparallel axis of projection bisect Brocard circle Brocard point centre of projection centres of similitude circumcircle co-axal circles coincident collinear points complete quadrangle complete quadrilateral concurrent lines conic conjugate points conjugates with respect COR.-The corresponding points cross ratio DEFINITIONS diagonal triangle equi-cross external bisectors figure focoids form a harmonic four points four straight lines given circle harmonic conjugates harmonic pencil harmonic range imaginary points infinite distance inscribed isogonal conjugates joining the centres limiting points line at infinity line be drawn locus meet middle points nine-point circle opposite sides opposite vertices orthocentre pair of conjugate perpendicular points lie points of intersection points or rays POLE AND POLAR polygons radical axis radii range or pencil right angles segments semiperimeter sides BC sponding straight line joining symmedian point system of co-axal tangents drawn Theor THEOREM three circles transversal vanishing line vertex
Popular passages
Page 12 - D are said to be harmonic conjugates of each other with respect to the points A and B, and AB is said to be harmonically divided by the points C and D. If C and D are harmonic with respect to A and B, then A and B are harmonic with respect to C and D. Harmonic range The four points A, B, C, D are referred to as a harmonic range, denoted by (ABC D), \fC and D are harmonic conjugates with respect to A and B.
Page 7 - The bisectors of the angles of a triangle meet the opposite sides in three points on a straight line.
Page 19 - The locus of a point from which tangents drawn to two given circles are equal is a straight line*.
Page 20 - The locus of a point whose powers with respect to two given circles are equal is called the radical axis of the two given circles.
Page 6 - DEFINITION. Each of the three straight lines which join the angular points of a triangle to the middle points of the opposite sides is called a Median of the triangle. ON PROP. 37. 1. If, in the figure of Prop. 37, AC and BD intersect in K, shew that (i) the triangles AKB, DKC are equal in area, (ii) the quadrilaterals EBKA, FCKD are equal. 2. In the figure of I. 16, shew that the triangles ABC, FBC are equal in area. 3. On the...