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You can remember it like this: “What’s the volume of a sphere?” is a geometry concern. “What’s the difference between a sphere and a donut?” is a topology concern.

Topologically, your garden may possibly be one connected region with no holes, or it could have one or more holes in it. If the ‘hole’ in your garden is a small obstacle like a mailbox, or a large one like a bunch of bushes, those are topologically the same. We’re just concerned with how many holes you've got to circumnavigate during your mow.https://backyardmash.com/gardening/how-to-mow-your-lawn-using-math/