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Artist

  • ? shitacemayo 563

Copyright

  • ? touhou 1.0M

Character

  • ? kamishirasawa keine 17k

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  • ? 1girl 7.8M
  • ? :d 718k
  • ? black shoes 245k
  • ? blue dress 169k
  • ? blue hair 1.1M
  • ? blue hat 73k
  • ? bobby socks 11k
  • ? book 178k
  • ? border 226k
  • ? bow 1.6M
  • ? breasts 4.6M
  • ? bright pupils 134k
  • ? chalkboard 12k
  • ? classroom 24k
  • ? cleavage 1.3M
  • ? dated 249k
  • ? dress 1.8M
  • ? footwear bow 11k
  • ? full body 1.2M
  • ? hat 1.6M
  • ? holding 2.0M
  • ? holding book 66k
  • ? holding pointer 1.1k
  • ? indoors 508k
  • ? long hair 5.7M
  • ? looking at viewer 4.5M
  • ? math 1.4k
  • ? neckerchief 235k
  • ? open mouth 3.2M
  • ? pointer 2.7k
  • ? puffy short sleeves 239k
  • ? puffy sleeves 482k
  • ? red bow 298k
  • ? red eyes 1.7M
  • ? red neckerchief 70k
  • ? shoes 779k
  • ? short sleeves 837k
  • ? smile 3.8M
  • ? socks 534k
  • ? solo 6.5M
  • ? standing 1.2M
  • ? teacher 6.2k
  • ? twitter username 397k
  • ? white border 142k
  • ? white pupils 108k
  • ? white socks 202k
  • ? wooden floor 37k

Meta

  • ? commentary 2.8M
  • ? highres 7.4M
  • ? translated 629k

Information

  • ID: 4643172
  • Uploader: Below273 »
  • Date: almost 5 years ago
  • Size: 333 KB .jpg (1668x2224) »
  • Source: x.com/shitace1/status/1416043036644036611 »
  • Rating: General
  • Score: 26
  • Favorites: 34
  • Status: Active

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Resized to 50% of original (view original)
kamishirasawa keine (touhou) drawn by shitacemayo

Artist's commentary

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  • Translated
  • シンプルに慧音先生

    Simply Keine-sensei

    • ‹ prev Search: boot_bow next ›
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    NNescio
    almost 5 years ago
    [hidden]

    The reason why they picked 3.05 and not 3 is to stymie people trying to go for the easy solution involving an inscribed hexagon.

    The textbook answer is to use an inscribed dodecagon (12-gon).

    The elegant answer (using pure geometry) is to use an inscribed decagon (10-gon), since it's the smallest n-gon you'll need and also has beautiful golden ratios.

    The most 'elegant' answer is to use the 1968 Putnam integral. Though this might be a bit overkill and relies on more recent mathematical developments (i.e. calculus, not just geometry). But it is very, very beautiful and succinct.

    They are also lot of other possible proofs, some more elegant than the others, and some downright cheeky. Though knowing the Baka Group they'll probably go for something like 𝜋 = 3.142... > 3.05, which doesn't count as a proof because it's tautological. And by "they" I mean Dai-chan. The rest will probably just go "wuhhh" or "Is pie tasty?"

    Updated by NNescio almost 5 years ago

    21 Reply
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    Zaku Zelo
    almost 5 years ago
    [hidden]

    NNescio said:

    The reason why they picked 3.05 and not 3 is to stymie people trying to go for the easy solution involving an inscribed hexagon.

    The textbook answer is to use an inscribed dodecahedron (12-gon).

    The elegant answer (using pure geometry) is to use an inscribed decahedron (10-gon), since it's the smallest n-gon you'll need and also has beautiful golden ratios.

    The most 'elegant' answer is to use the 1968 Putnam integral. Though this might be a bit overkill and relies on more recent mathematical developments (i.e. calculus, not just geometry). But it is very, very beautiful and succinct.

    They are also lot of other possible proofs, some more elegant than the others, and some downright cheeky. Though knowing the Baka Group they'll probably go for something like 𝜋 = 3.142... > 3.05, which doesn't count as a proof because it's tautological. And by "they" I mean Dai-chan. The rest will probably just go "wuhhh" or "Is pie tasty?"

    So basically what you're saying is I can't get in to Tokyo University.

    16 Reply
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    FWP
    almost 5 years ago
    [hidden]

    School had accepted our (technical education) class answer of grabbing a measuring tape and measuring both the circumference and the diameter of the teacher's cup.

    Apparently not the first time our side of the education system used that bypass.

    8 Reply
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    ygm 1
    almost 5 years ago
    [hidden]

    ...𝜋 = 3.142... > 3.05...

    Proof by Just Trust Me Bro

    9 Reply
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    NNescio
    almost 5 years ago
    [hidden]

    ygm_1 said:

    Proof by Just Trust Me Bro

    Assume 𝜋 = 3.142
    ∴ 𝜋 > 3.05
    Q.E.D!

    5 Reply
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    Xinser
    almost 5 years ago
    [hidden]

    You can say I'm Cirno in this comment section

    7 Reply
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    someguyted
    over 3 years ago
    [hidden]

    NNescio said:

    The reason why they picked 3.05 and not 3 is to stymie people trying to go for the easy solution involving an inscribed hexagon.

    The textbook answer is to use an inscribed dodecagon (12-gon).

    The elegant answer (using pure geometry) is to use an inscribed decagon (10-gon), since it's the smallest n-gon you'll need and also has beautiful golden ratios.

    The most 'elegant' answer is to use the 1968 Putnam integral. Though this might be a bit overkill and relies on more recent mathematical developments (i.e. calculus, not just geometry). But it is very, very beautiful and succinct.

    They are also lot of other possible proofs, some more elegant than the others, and some downright cheeky. Though knowing the Baka Group they'll probably go for something like 𝜋 = 3.142... > 3.05, which doesn't count as a proof because it's tautological. And by "they" I mean Dai-chan. The rest will probably just go "wuhhh" or "Is pie tasty?"

    I’m no math whiz, but I’m curious what would make a mathematical proof “cheeky”

    1 Reply
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    Kanzaku
    about 3 years ago
    [hidden]

    Xinser said:

    You can say I'm Cirno in this comment section

    Same

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    Problem
    Prove that 𝜋 is greater than 3.05.
    A common University of Tokyo entrance exam problem during the early 2000s.
    July 16
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