What is Descartes' Method of investigation called?

What is Descartes' Method of in" rel="nofollow">in" rel="nofollow">in" rel="nofollow">investigation called? How does he use this method to question what his senses tell him? Why does his primary reason for not trustin" rel="nofollow">in" rel="nofollow">in" rel="nofollow">ing his senses fail to cast doubt on the truths of arithmetic and geometry? Is there any way, accordin" rel="nofollow">in" rel="nofollow">in" rel="nofollow">ing to Descartes, of raisin" rel="nofollow">in" rel="nofollow">in" rel="nofollow">ing doubt about even these truths? Are all truths brought in" rel="nofollow">in" rel="nofollow">in" rel="nofollow">into doubt by this method? Does any belief survive?