Simple-looking horrifyingly difficult (to me) resistance circuits
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I'm doing some physics homework calculating the total resistance between points A and B and while some circuits are comprehensible, there are two that I can't understand how they work at all. So, it is my pleasure to present to you these two monstrosities: How do I approach the crossing resistances in each one? Here's where I am as of writing this post: THE DIVIDED SQUARE: The two 10k resistances are parallel to each other The 20k and 9k resistances are parallel to each other I don't know what to do with the 5k one THE HELLBORN TRIANGLES OF DEATH: The first and last pair of 5k resistances are parallel to each other The bottom center 5k resistance is in series with the previous two couples I don't know what to do with the 15k ones So, long story short, how should I approach th