Mathematics for IGCSE & O level - Transformations (Section 6 - No. 1)
If a shape undergoes a rotation of 180 degrees, what changes about the coordinates?
(x, y) becomes (-x, y)
(x, y) becomes (x, -y)
(x, y) becomes (-x, -y)
(x, y) remains unchanged.
解释
A 180-degree rotation changes (x, y) to (-x, -y).