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Find angle in a open curve

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Sajid Rahim
Sajid Rahim 2017-7-31
评论： Sajid Rahim 2017-8-29
in image step wise I show the wanted result.... But i am new in matlab in have no coding expernce so plz help me....

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KSSV
KSSV 2017-7-31
Let P1, P2,P3 be three points....with P2 in middle....get two vectors and use the formula given in this link: https://in.mathworks.com/matlabcentral/answers/101590-how-can-i-determine-the-angle-between-two-vectors-in-matlab
u = P2-P1 ;
v = P2-P3 ;

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