No, that’s a punctured disk, you’re thinking of a torus.
Edit: After dusting off my old-ass-hasn’t-been-in-uni-for-10-years-brain, I’ve concluded the straw shown in the image is NOT a punctured disk, it’s a closed annulus. It’s still not a coffee mug and you’re still thinking of a torus but I don’t wanna go around spreading wrong math.
After it’s flat it’s ready to be made into a coffee cup
No, that’s a punctured disk, you’re thinking of a torus.
Edit: After dusting off my old-ass-hasn’t-been-in-uni-for-10-years-brain, I’ve concluded the straw shown in the image is NOT a punctured disk, it’s a closed annulus. It’s still not a coffee mug and you’re still thinking of a torus but I don’t wanna go around spreading wrong math.