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  2. Contour line - Wikipedia

    en.wikipedia.org/wiki/Contour_line

    Edmond Halley's New and Correct Chart Shewing the Variations of the Compass (1701). The idea of lines that join points of equal value was rediscovered several times. The oldest known isobath (contour line of constant depth) is found on a map dated 1584 of the river Spaarne, near Haarlem, by Dutchman Pieter Bruinsz. [7]

  3. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.

  4. Pie chart - Wikipedia

    en.wikipedia.org/wiki/Pie_chart

    Pie chart of populations of English native speakers. A pie chart (or a circle chart) is a circular statistical graphic which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area) is proportional to the quantity it represents.

  5. Cartesian coordinate system - Wikipedia

    en.wikipedia.org/wiki/Cartesian_coordinate_system

    Fig. 7 – The left-handed orientation is shown on the left, and the right-handed on the right. Fig. 8 – The right-handed Cartesian coordinate system indicating the coordinate planes. Once the x- and y-axes are specified, they determine the line along which the z-axis should lie, but there are two possible orientations for this line.

  6. 15 Best New Packable Lunches to Make This Month - AOL

    www.aol.com/15-best-packable-lunches-month...

    This lemon-dill tuna salad packs plenty of protein and gets a boost of flavor from sumac—a spice used in Middle Eastern, Mediterranean and North African cooking that adds a citrusy touch ...

  7. Trump arrives in Washington as inauguration celebrations ...

    www.aol.com/news/trumps-return-washington...

    STERLING, Virginia (Reuters) -President-elect Donald Trump arrived in the Washington area on Saturday evening for a celebration of his return to power ahead of an inauguration ceremony that has ...

  8. Christina Aguilera Poses Nearly Nude to Mark Her 44th ... - AOL

    www.aol.com/lifestyle/christina-aguilera-poses...

    Christina Aguilera is leaving nothing behind as she turns another year older.. On Wednesday, Dec. 18, the singer posted a nearly nude black and white photo of herself on Instagram to mark her 44th ...

  9. Cartography - Wikipedia

    en.wikipedia.org/wiki/Cartography

    A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy's Geography and using his second map projection. The translation into Latin and dissemination of Geography in Europe, in the beginning of the 15th century, marked the rebirth of scientific cartography, after more than a millennium of stagnation.