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  2. Arnold Ridley - Wikipedia

    en.wikipedia.org/wiki/Arnold_Ridley

    William Arnold Ridley was born in Walcot, Bath, Somerset, England, the son of Rosa Caroline (née Morrish, 1870–1956) and William Robert Ridley (1871–1931). [4] His father was a gymnastics instructor and ran a boot and shoe shop. He attended the Clarendon School and the Bath City Secondary School where he was a keen sportsman.

  3. Geometrical-optical illusions - Wikipedia

    en.wikipedia.org/wiki/Geometrical-optical_illusions

    The widely accepted interpretation of, e.g. the Poggendorff and Hering illusions as manifestation of expansion of acute angles at line intersections, is an example of successful implementation of a "bottom-up," physiological explanation of a geometrical–optical illusion. Ponzo illusion in a purely schematic form and, below, with perspective clues

  4. File:Arnold Ridley 1921.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Arnold_Ridley_1921.jpg

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  5. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    The 30°–60°–90° triangle is the only right triangle whose angles are in an arithmetic progression. The proof of this fact is simple and follows on from the fact that if α, α + δ, α + 2δ are the angles in the progression then the sum of the angles 3α + 3δ = 180°. After dividing by 3, the angle α + δ must be 60°. The right angle ...

  6. Acute and obtuse triangles - Wikipedia

    en.wikipedia.org/wiki/Acute_and_obtuse_triangles

    In an acute triangle, the sum of the circumradius R and the inradius r is less than half the sum of the shortest sides a and b: [4]: p.105, #2690 + < +, while the reverse inequality holds for an obtuse triangle. For an acute triangle with medians m a, m b, and m c and circumradius R, we have [4]: p.26, #954

  7. A post shared by Arnold Schwarzenegger (@schwarzenegger) “Santa Claus is coming to town!” Schwarzenegger captioned a photo on Dec. 17 on Instagram with costar Alan Ritchson.

  8. The true story of “Surviving Black Hawk Down”:“ ”Unpacking ...

    www.aol.com/true-story-surviving-black-hawk...

    The Battle of Mogadishu occurred on October 3 and 4, 1993. Writing for Smithsonian , Bowden described the conflict as an "18-hour urban firefight" between U.S. forces and the Somali National Alliance.

  9. Private Godfrey - Wikipedia

    en.wikipedia.org/wiki/Private_Godfrey

    Private Charles Godfrey MM is a fictional Home Guard soldier, first portrayed by Arnold Ridley in the British television sitcom Dad's Army. [1] He is retired and was previously a tailor for the Civil Service Stores or the Army & Navy Stores.