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# GEOMETRY OF CONICS Conic Sections - Math is Fun
So all those curves are related. Focus! The curves can also be defined using a straight line (the directrix) and a point (the focus). When we measure the distance: from the focus to any point on the curve, and; perpendicularly from the directrix to
Chord (geometry) - Wikipedia
A chord of a circle is a straight line segment whose endpoints both lie on a circular arc infinite line extension of a chord is a secant line, or just secant generally, a chord is a line segment joining two points on any curve, for instance, an ellipse.A chord that passes through a circle's center point is the circle's diameter word chord is from the Latin chorda meaning bowstring.
Projective geometry - Wikipedia
Projective geometry is an elementary non-metrical form of geometry, meaning that it is not based on a concept of distance two dimensions it begins with the study of configurations of points and lines there is indeed some geometric interest in this sparse setting was first established by Desargues and others in their exploration of the principles of perspective art.
Free Geometry Books Download | Ebooks Online Textbooks
Introduction to the Geometry of the Triangle. This note explains the following topics: The circumcircle and the incircle, The Euler line and the nine-point circle, Homogeneous barycentric coordinates, Straight lines, Circles, Circumconics, General Conics.       