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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = ⁠ 13×5 / 2 ⁠ = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.

  3. Lesson plan - Wikipedia

    en.wikipedia.org/wiki/Lesson_plan

    A lesson plan is envisaged as a blue print, guide map for action, a comprehensive chart of classroom teaching-learning activities, an elastic but systematic approach for the teaching of concepts, skills and attitudes. The first thing for setting a lesson plan is to create an objective, that is, a statement of purpose for the whole lesson.

  4. Tangential triangle - Wikipedia

    en.wikipedia.org/wiki/Tangential_triangle

    The reference triangle's circumcircle, its nine-point circle, its polar circle, and the circumcircle of the tangential triangle are coaxal. [1]: p. 241 A right triangle has no tangential triangle, because the tangent lines to its circumcircle at its acute vertices are parallel and thus cannot form the sides of a triangle.

  5. Living Books - Wikipedia

    en.wikipedia.org/wiki/Living_Books

    Living Books is a series of interactive read-along adventures aimed at children aged 3–9. Created by Mark Schlichting, the series was mostly developed by Living Books for CD-ROM and published by Broderbund for Mac OS and Microsoft Windows.

  6. Mathematics education in the United States - Wikipedia

    en.wikipedia.org/wiki/Mathematics_education_in...

    Students learn the rudiments of propositional logic, methods of proof (direct and by contradiction), parallel lines, triangles (congruence and similarity), circles (secants, tangents, chords, central angles, and inscribed angles), the Pythagorean theorem, elementary trigonometry (angles of elevation and depression, the law of sines), basic ...

  7. Texas warning of "maneater" screwworms that lay eggs in flesh

    www.aol.com/texas-warning-maneater-screwworms...

    Just one fly can lay up to 300 eggs at a time and is drawn "to the odor of a wound or natural opening on a live, warm-blooded animal."

  8. Jay-Z's attorney says in new filing that rape allegations are ...

    www.aol.com/entertainment/jay-zs-attorney-says...

    A lawyer for Shawn "Jay-Z" Carter is fighting back against the sexual assault allegations he's facing in a new lawsuit.

  9. Pencil (geometry) - Wikipedia

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

    The line of centers is perpendicular to the radical plane, which is a real plane in the pencil containing the imaginary circle. If the spheres intersect in a point A, all the spheres in the pencil are tangent at A and the radical plane is the common tangent plane of all these spheres. The line of centers is perpendicular to the radical plane at A.

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