I assume they mean find angle ABC
I would find vector BA
then find vector BC
then use either dot or cross product, dot product might be easier
BA dot BC = |BA| |BC| cos (ABC)
solve for ABC
Find the interior angle formed by points A(1,5,3) , B(-2,3,7) , C(3,2,5).
does this mean i need to find all the 3 angles of triangle?
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