Drawing an arc between two elements?

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I want to draw an arc (given its centre and its radius) between two elements.
For example the case given in the image below. I would like to draw an arc (of radius 0.5 (as an example) and the centre de point P drawed) strictly between those two lines
What is the general case of doing it? I mean, in this particular case there are two lines, but I would like a method that would work for whatever elements between I'd want to draw an arc (between a circle and a line, between two circles...etc).
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KSSV
KSSV 2020-10-22
You have not commented on your previous question...
If the answer worked for you..you have to acknowledge the users who have helped you. With out closing that question, you are asking another question similiar ti it?

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KSSV
KSSV 2020-10-22
L1=[1 3;
1 6]
L2=[-2 2;
8 -1]
P=InterX(L1,L2);
L = [L2(:,1) P L1(:,2)] ;
p = polyfit(L(1,:),L(2,:),2) ;
xi = linspace(min(L(1,:)),max(L(1,:))) ;
yi = polyval(p,xi) ;
figure
hold on
plot(L1(1,:),L1(2,:),'r')
plot(L2(1,:),L2(2,:),'b')
plot(P(1),P(2),'ro')
plot(xi,yi,'k')
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