If you can't see this animation on your Web browser, then click here to download it to see the solution!
Click here to simply see the still image version.
Note: A 2-dimensional heart can also be a combination of a circle & a square! In that case, the formula for the area is: A = πr2 + 4r2, because 2 sides of the square are equal to the circle's diameter, which is twice the radius!
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© Derek Cumberbatch