Use Vectors to Find the Measure of the Angle at Vertex

question 3

Short Answer

Use vectors to find the measure of the angle at vertex B of triangle ABC, when $A = ( 5,2 )$ , $B = ( - 4,1 )$ , and $C = ( - 1 , - 3 )$ . Round answer to two decimal places.
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Definitions:

Polypeptide

A molecule consisting of a chain of amino acids linked by peptide bonds, and is the building block of proteins.

Amino Acid Sequences

The order in which amino acids are linked together by peptide bonds in a protein or peptide.

Enzyme

Biological catalysts which accelerate chemical reactions in living organisms by lowering the activation energy.

Racemic Acid

A mixture of equal amounts of two enantiomers of an acid, making it optically inactive.