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18 lines
649 B
18 lines
649 B
---
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id: geometry
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title: Geometry
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---
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## Notes
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When comparing euclidean distance between two pairs of points, using dx<sup>2</sup> + dy<sup>2</sup> is sufficient. It is unnecessary to square root the value.
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To find out if two circles overlap, check that the distance between the two centers of the circles is less than the sum of their radii.
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## More questions
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- You have a plane with lots of rectangles on it, find out how many of them intersect.
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- Which data structure would you use to query the k-nearest points of a set on a 2D plane?
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- Given many points, find k points that are closest to the origin.
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- How would you triangulate a polygon?
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