Descartes says, "I can demonstrate diverse properties of the triangle, all of which are assuredly true since I clearly conceive them: and they are therefore something; and I have already fully shown the truth of the principle, that whatever is clearly and distinctly known is true."

Question

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Descartes argues that he can demonstrate properties of a triangle that are clearly and distinctly known, and therefore true. He also asserts the principle that whatever is clearly and distinctly known is true. Therefore, his argument is that the properties of the triangle he demonstrates are true.

Descartes Says, "I Can Demonstrate Diverse Properties of the Triangle