Someone help me do this question

let (C) be the part of the circle x^2 + y^2 = 4 that lies below the line y = x. Plot (C) in the plane xOy.

[Jan]

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Answer 1

[DGM]

Consider two different approaches

n = 15; % how many points to plot

r = 2;
th = linspace(pi,2*pi,n);
x = r*cos(th);
y = r*sin(th);

subplot(2,1,1)
plot(x,y); grid on
axis equal

x = linspace(-2,2,n);
y = -sqrt(r^2-x.^2);

subplot(2,1,2)
plot(x,y); grid on
axis equal

Notice anything different?