Talk:Cardioid

Move the graph to the top?

- seconded

Huh?? Why move a chunk of page content off to a subpage? Dysprosia 01:27, 19 May 2005 (UTC)

See Wikipedia:WikiProject Mathematics/Proofs#Cardioid. -- Jitse Niesen 11:33, 19 May 2005 (UTC)

Pear?

I'm no geometer, but it looks like the cross-section of a globe tomato to me.

Images

I do not understand how the images can be understood - what are x and y? --Abdull 16:11, 23 May 2006 (UTC)

The Equations section describes x and y in terms of theta. --Jevon 20:39, 25 May 2006 (UTC)

The equations express the rectangular coordinates of the curve, x and y, in terms of a parameter theta. That is, for each value of theta, compute x(theta) and y(theta), and plot the point (x,y) measured x units to the right of the y axis, and y units above the x axis (other direction for negatives). The set of all such points makes the curve shown in the image. So, x and y are just numbers to describe the location of a point on a curve. Dicklyon 22:25, 5 June 2006 (UTC)

The other way to understand the images is to ignore x and y, and just look at rho (radius) and theta. At each angle theta measured from the positive x axis, compute the radius rho and put a point that far from the origin. At 180 degrees, the formula 1+cos(theta) gives zero, so you get a point at the origin, which is the cusp. By displacing theta, or using sin instead of cosine, the whole picture just rotates around that cusp. Dicklyon 22:29, 5 June 2006 (UTC)

IMHO should be merged with into Heart (Symbol)

IMHO should be merged with into Heart (Symbol) --Wulf 03:17, 5 June 2006 (UTC)

Absolutely not. Read the article. The two shapes are not the same. Dysprosia 03:23, 5 June 2006 (UTC)