Hello, Sunshine. Welcome to English Forums-- I don't offhand know of any such sites, and that's why we're here-- what would you like to pronounce? How about: 'The square of the hypotenuse (/hai 'pa:t ?
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Hmm, I see what you mean, Sunshine. Well, I found SIGMA at least. You might checking out the sites that appear when you google for 'mathematical terminology' or 'mathematical dictionary'. I don't know what your native language is, but there seem to be a number of bilingual websites.