The origin is the point where the axes intersect.
This would be point where x is 0 and y is 0 i.e (0,0)
Rotation of a point through 180°, about the origin when a
point M (h, k) is rotated about the origin O through 180° in anticlockwise or
clockwise direction, it takes the new position M' (-h, -k).
Hope this helps.
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