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In chapter 16, exercise 10b: The midpoint formula is required not the average length of the difference #136

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4 changes: 2 additions & 2 deletions 16/exercises/10/README.md
Original file line number Diff line number Diff line change
Expand Up @@ -38,8 +38,8 @@ int area_rectangle(struct rectangle r) {

```c
struct point rectangle_center(struct rectangle r) {
return (struct point) {(r.lower_right.x - r.upper_left.x) / 2,
(r.lower_right.y - r.upper_left.y) / 2};
return (struct point) {(r.lower_right.x + r.upper_left.x) / 2,
(r.lower_right.y + r.upper_left.y) / 2};
}
```

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