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"Half-turn" ambigrams or point reflection ambigrams, commonly called "upside-down words", are 180° rotational symmetrical calligraphies. [7] They can be read right side up or upside down, or both. Rotation ambigrams are the most common type of ambigrams for good reason.
Half turns, C 2, are needed to complete. Rank 3 groups Other names Example geometry Example finite subgroups; O(3) ... Full circular symmetry with half turn
A half-turn may refer to: One half of a full turn, an angle measure equivalent to 180 degrees or π radians Considering only points in a plane, a half turn is equivalent to a point reflection; Pi (π), a mathematical constant representing a half-turn in radians; A U-turn: a driving maneuver used to reverse direction
The number 619 is strobogrammatic.. A strobogrammatic number is a number whose numeral is rotationally symmetric, so that it appears the same when rotated 180 degrees. [1] In other words, the numeral looks the same right-side up and upside down (e.g., 69, 96, 1001). [2]
Alternative meanings are often yielded when the design is transformed or the observer moves, but they can also result from a shift in mental perspective. This animation shows a half-turn ambigram of the word ambigram. The word is written calligraphically with 180-degree rotational symmetry, such that it reads identically when viewed upside down.
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San Francisco 49ers running back Christian McCaffrey (23) runs against Buffalo Bills safety Taylor Rapp, bottom, during the first half of an NFL football game in Orchard Park, N.Y., Sunday, Dec. 1 ...
For a semicircle with a diameter of a + b, the length of its radius is the arithmetic mean of a and b (since the radius is half of the diameter). The geometric mean can be found by dividing the diameter into two segments of lengths a and b, and then connecting their common endpoint to the semicircle with a segment perpendicular to the diameter ...