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The word
[三角](https://ja.wikipedia.org/wiki/%E4%B8%89%E8%A7%92%E7%B5%9E%E3%82%81) is
often used in judo to describe a position enclosing your opponent's head and
arm in a "triangle" created by interlocking your legs. However this word is
occasionally spelled _san **g** aku_ (as opposed to the expected _san **k**
aku_):

> **37.** Omote-sangaku  
>  **38.** Ashi-sangaku-garami  
>  ...  
>  **45.** Yoko-sangaku
>
>   * _Fighting Judo_ , Katsuhiko Kashiwazaki
>

Is this just a typo, or an example of rendaku in the author's dialect?

i.e. is 三角 ever pronounced さん **が** く?
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question
sports rendaku
Is 三角 pronounced "sangaku" in any dialects?
[Weblio's hits for
さんがく](https://www.weblio.jp/content/%E3%81%95%E3%82%93%E3%81%8C%E3%81%8F)
don't include 三角, which would suggest that this isn't standard.

Google searches for
["よこさんがく"](https://www.google.com/search?q=%22%E3%82%88%E3%81%93%E3%81%95%E3%82%93%E3%81%8C%E3%81%8F%22)
and
["あしさんがく"](https://www.google.com/search?q=%22%E3%81%82%E3%81%97%E3%81%95%E3%82%93%E3%81%8C%E3%81%8F%22)
also return zero hits, while searches for
["よこさんかく"](https://www.google.com/search?q=%22%E3%82%88%E3%81%93%E3%81%95%E3%82%93%E3%81%8B%E3%81%8F%22)
and
["あしさんかく"](https://www.google.com/search?q=%22%E3%81%82%E3%81%97%E3%81%95%E3%82%93%E3%81%8B%E3%81%8F%22)
with the unvoiced か return relevant sites.

I see that [Kashiwazaki is from
Iwate](https://en.wikipedia.org/wiki/Katsuhiko_Kashiwazaki), and I believe
that this kind of softening or additional voicing is a feature of dialects in
the northeast. I lived in Morioka for a while years ago, and was interested to
hear such additional voicing among the speakers there, things like 度【たび】 being
pronounced as たんび, or a kind of interjectionary particle a bit like ね or そう,
but realized as んだ.

→ This leads me to think that the さんがく pronunciation might be an expression of
Kashiwazaki's Iwate-ben.
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answer
Short answer to you question would be neither of them is "right". Only right
way to write that word in English is "triangle" (assuming the translation was
correct).

Long Answer: Japanese is ONLY written with Kanjis, Hiragana and Katakana
characters (plus few more obscure character sets). Japanese is NOT written in
latin characters. Any Japanese written with latin chracters is just phonetics,
what the Japanese word sounds similar to some other language (like English).
Japanese written in latin is a learning aid, not real language. There is no
one right way to spell Japanese words with latin characters. Debating latin
spelling of Japanese words is like debating correct spelling for the sound a
wind makes. Only right way to spell Japanese words is in Japanese.

In Japan event the signs for train station and cities have varying spelling in
latin character. For a bad example there is only one right way to write name
of Japan's capital is 東京. Well, if you want to nit pick there are like 4
different character sets you can use but none of them is latin. So 東京 written
in latin characers the "Tohkyo", "Tokio", "Tokyo", "Tookio" all equally right
or wrong. Note that in this case a English translation of the capital's name
is "Tokyo", like the "triangle" would be for the word in the question.
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