Answer true or false: the people in the northern hemisphere experience the seasons opposite of the people in the southern hemisphere

That's TRUE.

For example:

--  When it's Winter in Canada, the USA, and France, it's Summer in Australia, Paraguay, and Namibia.  (This is the end of December, all of January and February, and most of March.)

-- When it's Winter in Tasmania, South Africa, and Botswana, it's Summer in Germany, Israel, and Mexico.  (This is the end of June, all of July and August, and most of September.)

-- The Spring and Fall are opposite too.

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y