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2. Mnemonics in trigonometry - Wikipedia

   en.wikipedia.org/wiki/Mnemonics_in_trigonometry

   Signs of trigonometric functions in each quadrant. All Students Take Calculus is a mnemonic for the sign of each trigonometric functions in each quadrant of the plane. The letters ASTC signify which of the trigonometric functions are positive, starting in the top right 1st quadrant and moving counterclockwise through quadrants 2 to 4.

3. iCivics - Wikipedia

   en.wikipedia.org/wiki/ICivics

   iCivics, Inc. (formerly Our Courts) is a 501(c)(3) non-profit organization in the United States that provides educational online games and lesson plans to promote civics education and encourage students to become active citizens.

4. Big Ideas Learning - Wikipedia

   en.wikipedia.org/wiki/Big_Ideas_Learning

   In 2014, Big Ideas Learning debuted the Big Ideas Math Algebra 1, Geometry, and Algebra 2 Common Core high school mathematics curriculum. The company also announced that it will be releasing the Big Ideas Math Course 1, Course 2, and Course 3 Common Core integrated high school mathematics curriculum in the spring of 2015.

5. 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.

6. Matchstick puzzle - Wikipedia

   en.wikipedia.org/wiki/Matchstick_puzzle

   A matchstick puzzle ("Move 1 matchstick to make the equation 6+4=4 valid") and its solution below. Matchstick puzzles are rearrangement puzzles in which a number of matchsticks are arranged into shapes or numbers, and the problem to solve is usually formulated as moving a fixed number of matchsticks to achieve some specific other arrangement.

7. n-dimensional sequential move puzzle - Wikipedia

   en.wikipedia.org/wiki/N-dimensional_sequential...

   Magic Cube 5D by Roice Nelson is capable of rendering 5-cube puzzles in six sizes from 2 5 to 7 5. Allows 5D twists and controls for rotating the cube in multiple dimensions, 4-D and 5-D perspective controls, cubie and sticker spacing and size controls, similar to Magiccube4D. However, a 5-D puzzle is much more difficult to comprehend than a 4 ...