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  2. Parallel postulate - Wikipedia

    en.wikipedia.org/wiki/Parallel_postulate

    Two lines that are parallel to the same line are also parallel to each other. In a right-angled triangle, the square of the hypotenuse equals the sum of the squares of the other two sides (Pythagoras' theorem). [6] [7] The law of cosines, a generalization of Pythagoras' theorem. There is no upper limit to the area of a triangle. (Wallis axiom) [8]

  3. Angle of parallelism - Wikipedia

    en.wikipedia.org/wiki/Angle_of_parallelism

    János Bolyai discovered a construction which gives the asymptotic parallel s to a line r passing through a point A not on r. [1] Drop a perpendicular from A onto B on r. Choose any point C on r different from B. Erect a perpendicular t to r at C. Drop a perpendicular from A onto D on t. Then length DA is longer than CB, but shorter than CA.

  4. Concurrent lines - Wikipedia

    en.wikipedia.org/wiki/Concurrent_lines

    The de Longchamps point is the point of concurrence of several lines with the Euler line. Three lines, each formed by drawing an external equilateral triangle on one of the sides of a given triangle and connecting the new vertex to the original triangle's opposite vertex, are concurrent at a point called the first isogonal center .

  5. Parallel (geometry) - Wikipedia

    en.wikipedia.org/wiki/Parallel_(geometry)

    the distance between the two lines can be found by locating two points (one on each line) that lie on a common perpendicular to the parallel lines and calculating the distance between them. Since the lines have slope m , a common perpendicular would have slope −1/ m and we can take the line with equation y = − x / m as a common perpendicular.

  6. Angle - Wikipedia

    en.wikipedia.org/wiki/Angle

    Download as PDF; Printable version; In other projects ... or full angle are special and are respectively called ... (2009), "Angles in Intersecting and Parallel Lines ...

  7. Dupin indicatrix - Wikipedia

    en.wikipedia.org/wiki/Dupin_indicatrix

    For parabolic points, where the Gaussian curvature is zero, the intersection will form two parallel lines. The direction of those two lines are the same as the asymptotic directions . In particular, the indicatrix of each point on a developable surface is a pair of lines parallel to the generatrix .

  8. Thales's theorem - Wikipedia

    en.wikipedia.org/wiki/Thales's_theorem

    adjacent angles in a parallelogram are supplementary (add to 180°) and, the diagonals of a rectangle are equal and cross each other in their median point. Let there be a right angle ∠ ABC, r a line parallel to BC passing by A, and s a line parallel to AB passing by C. Let D be the point of intersection of lines r and s.

  9. Line (geometry) - Wikipedia

    en.wikipedia.org/wiki/Line_(geometry)

    For a convex quadrilateral with at most two parallel sides, the Newton line is the line that connects the midpoints of the two diagonals. [7] For a hexagon with vertices lying on a conic we have the Pascal line and, in the special case where the conic is a pair of lines, we have the Pappus line. Parallel lines are lines in the same plane that ...