Boy I'm rusty on my Kant. Anyway, the Critique of Practical Reason will be useless. What you want is the Critique of Pure Reason, primarily the Transcendental Aesthetic. Kant grounds parts of the TA on geometry, so the development of non-Euclidean geometries was widely seen as undermining the foundations of Kantian metaphysics. IIRC, the Third Critique also has some information about Kant's views on natural science, but I'm pretty much only familiar with the Critiques, and not much beyond those. If you want to (and are allowed to) look at a secondary source, you can't really go wrong with Allan Wood. Paul Guyer is good as well.
Something to remember is that when Kant (or, more accurately, Kant's translators) uses the word 'intuition', he doesn't mean what we typically mean by the word. IIRC, he means something closer to sense data. Bear in mind also the ways in which the Transcendental Aesthetic is fundamental to Kant's later work in the KrV.
It might help if you said a little bit more about the class in general. What level is it, and what works of Kant's have you been studying?
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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."
"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."
-- Friedrich Nietzsche
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