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  2. Snub square tiling - Wikipedia

    en.wikipedia.org/wiki/Snub_square_tiling

    The snub square tiling can be constructed as a snub operation from the square tiling, or as an alternate truncation from the truncated square tiling.. An alternate truncation deletes every other vertex, creating a new triangular faces at the removed vertices, and reduces the original faces to half as many sides.

  3. Four Thirds system - Wikipedia

    en.wikipedia.org/wiki/Four_Thirds_system

    The usual size of the sensor is 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm, giving a diagonal of 21.64 mm. [17] [18] The sensor's area is about 30–40% smaller than APS-C sensors used in most other DSLRs, but still around 9 times larger than the 1/2.5" sensors typically used in compact digital cameras.