How can I mark a region in matlab ?

like this pic

[Thai Anh]

Full quest :

Let D be a domain bounded by x + y = 1, x = √y, and y = 0.

Sketch the domain

Answer 1

[Stephan]

x1 = 0:0.001:1;
y1 = x1.^2;
y2 = 1 - x1;
xcut = fzero(@(x)x.^2 - 1+x, 0.5);
x = [x1(x1<=xcut), x1(end)];
y = [x1(x1<=xcut).^2, 1-x1(end)];
P = polyshape(x,y);
plot(x1,y1,x1,y2,x,y)
hold on
plot(P)
hold off
xlim([0,1])
ylim([0,1])

[Thai Anh]

thank u, I really appreciate that :3