Meditation V:

"Concerning the Essence of Material Things, and Again Concerning God, That He Exists"

 

 

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ditation indicates), and "that its three angles are equal to two rights angles" and "its longest side is opposite its largest angle" as belonging to triangles.

 

However, it is important to note here that triangles do not exist, according to Descartes. And bodies have not yet been proven to exist, at this point in the Meditations. Hence, all distinct perceptions about what properties belong to things are wholly independent of whether those things and hence those properties actually exist. Descartes does not take this lesson to heart, as we will see, in his version of the Ontological Argument.