plotting cardioid and circle in one graph

hi. how do i plot the cardioid and the circle in one graph? here's the equation of cardioid=1+cos(t) and cirle=3*cos(t).

[Raj]

r=cos (theta)+2

Answer 1

[Thorsten]

Use polar

theta = linspace(0, 2*pi);
polar(theta, 1+cos(theta))
hold on
polar(theta, 3*cos(theta), 'r')

or if you prefer a Cartesian plot

r = 1+cos(theta);
plot(r.*cos(theta), r.*sin(theta))
hold on
r = 3*cos(theta);
plot(r.*cos(theta), r.*sin(theta), 'r')
axis equal

Answer 2

[Sk Rizwan Hossain]

r=1+cos(theta)