Question: Punkterna A : ( 4 , 1 , - 1 ) , B : ( 7 , 1 , 2 ) och C : (

Punkterna A:(4,1,-1),B:(7,1,2) och C:(4,3,1)r hrnen i en triangel. Berkna
triangelns area samt vinkeln i hrnet A.
 Punkterna A:(4,1,-1),B:(7,1,2) och C:(4,3,1)r hrnen i en triangel. Berkna triangelns area

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