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Artist

  • ? shitacemayo 567

Copyright

  • ? touhou 1.0M

Character

  • ? kamishirasawa keine 17k

General

  • ? 1girl 7.8M
  • ? :d 721k
  • ? black shoes 246k
  • ? blue dress 170k
  • ? blue hair 1.1M
  • ? blue hat 74k
  • ? bobby socks 11k
  • ? book 179k
  • ? border 228k
  • ? bow 1.6M
  • ? breasts 4.6M
  • ? bright pupils 135k
  • ? chalkboard 12k
  • ? classroom 24k
  • ? cleavage 1.3M
  • ? dated 250k
  • ? dress 1.8M
  • ? footwear bow 11k
  • ? full body 1.2M
  • ? hat 1.6M
  • ? holding 2.0M
  • ? holding book 66k
  • ? holding pointer 1.1k
  • ? indoors 510k
  • ? long hair 5.8M
  • ? looking at viewer 4.5M
  • ? math 1.4k
  • ? neckerchief 236k
  • ? open mouth 3.2M
  • ? pointer 2.7k
  • ? puffy short sleeves 240k
  • ? puffy sleeves 485k
  • ? red bow 300k
  • ? red eyes 1.7M
  • ? red neckerchief 70k
  • ? shoes 783k
  • ? short sleeves 841k
  • ? smile 3.9M
  • ? socks 537k
  • ? solo 6.6M
  • ? standing 1.2M
  • ? teacher 6.3k
  • ? twitter username 399k
  • ? white border 143k
  • ? white pupils 109k
  • ? white socks 203k
  • ? wooden floor 38k

Meta

  • ? commentary 2.8M
  • ? highres 7.5M
  • ? translated 630k

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

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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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