bayangan titik A(3,-4) jika diputar terhadap titik P(2,5) sejauh 180° adalah

A(3,-4) —[Rot. 180°, (2,5)]—› A'(x', y')

• x' = (3-2).Cos180° - (-4-5).Sin180° + 3
...x' = 1.(-1) - (-9)(0) + 3
...x' = -1 + 3
...x' = 2

• y' = (3-2).Sin180° - (-4-5).Cos180° + (-4)
...y' = (1)(0) - (-9)(-1) - 4
...y' = -9 - 4
...y' = -13

Maka, bayangannya adalah A'(2, -13)