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  2. Engel curve - Wikipedia

    en.wikipedia.org/wiki/Engel_curve

    The three parallel lines of Rs.300, Rs 400. And Rs.500 are called budget lines. And the slope of these three lines is the same, which implies that the prices of the two goods are constant, while the budget line farther from the origin indicates a larger budget amount. The three points R, S, and T in the graph hint different preference combinations.

  3. 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.

  4. Angle of parallelism - Wikipedia

    en.wikipedia.org/wiki/Angle_of_parallelism

    The angle depends on the segment length a between the right angle and the vertex of the angle of parallelism. Given a point not on a line, drop a perpendicular to the line from the point. Let a be the length of this perpendicular segment, and Π ( a ) {\displaystyle \Pi (a)} be the least angle such that the line drawn through the point does not ...

  5. 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]

  6. Transversal (geometry) - Wikipedia

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

    A transversal that cuts two parallel lines at right angles is called a perpendicular transversal. In this case, all 8 angles are right angles [1] When the lines are parallel, a case that is often considered, a transversal produces several congruent supplementary angles. Some of these angle pairs have specific names and are discussed below ...

  7. Parallel curve - Wikipedia

    en.wikipedia.org/wiki/Parallel_curve

    A parallel of a curve is the envelope of a family of congruent circles centered on the curve. It generalises the concept of parallel (straight) lines. It can also be defined as a curve whose points are at a constant normal distance from a given curve. [1]

  8. Keynesian cross - Wikipedia

    en.wikipedia.org/wiki/Keynesian_cross

    Since < the angle of this line will always be less than 45 degrees. Next, a 45 degree angle line representing the equality between aggregate expenditures and national income is introduced: =, The vertical intercept of this line is 0 while the slope is 1. Hence, the angle of this second line is:

  9. Intercept theorem - Wikipedia

    en.wikipedia.org/wiki/Intercept_theorem

    The converse of the theorem implies that a homothety transforms a line in a parallel line. Conversely, the direct statement of the intercept theorem implies that a geometric transformation is always a homothety of center O, if it fixes the lines passing through O and transforms every other line into a parallel line.