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2. Geometry Dash - Wikipedia

   en.wikipedia.org/wiki/Geometry_Dash

   Geometry Dash Lite is a free version of the game with advertisements and gameplay restrictions. Geometry Dash Lite includes only main levels 1-19, all tower levels, and a few selected levels that are either Featured, Daily, weekly or Event levels but does not offer the option to create levels or play most player-made levels. It also has a ...

3. Free Online Games: Play board games, card games, casino games ...

   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

4. 4Pi - Wikipedia

   en.wikipedia.org/wiki/4Pi

   IBM System/4 Pi, a family of avionics computers 4Pi microscope , a microscope that uses interference and fluorescence computers 4×π = 12.56637..., the solid angle of a complete sphere measured in steradians

5. 4Pi microscope - Wikipedia

   en.wikipedia.org/wiki/4Pi_Microscope

   A 4Pi microscope is a laser scanning fluorescence microscope with an improved axial resolution.With it the typical range of the axial resolution of 500–700 nm can be improved to 100–150 nm, which corresponds to an almost spherical focal spot with 5–7 times less volume than that of standard confocal microscopy.

6. Steradian - Wikipedia

   en.wikipedia.org/wiki/Steradian

   The steradian (symbol: sr) or square radian [1] [2] is the unit of solid angle in the International System of Units (SI). It is used in three dimensional geometry, and is analogous to the radian, which quantifies planar angles.

7. Pi - Wikipedia

   en.wikipedia.org/wiki/Pi

   The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

8. Fine-structure constant - Wikipedia

   en.wikipedia.org/wiki/Fine-structure_constant

   This has a relative standard uncertainty of 1.6 × 10 −10. [ 1 ] This value for α gives µ 0 = 4 π × 0.999 999 999 87 (16) × 10 −7 H⋅m −1 , 0.8 times the standard uncertainty away from its old defined value, with the mean differing from the old value by only 0.13 parts per billion .

9. List of formulae involving π - Wikipedia

   en.wikipedia.org/wiki/List_of_formulae_involving_π

   where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.