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Verified answer
Untuk pusat yang tidak (0, 0) geser dulu titik pusatnya ke (0, 0), jadi :(4, -6) + (2, -4) = (6, -10)
gunakan matriks rotasi
[cos 180° -sin 180°][6]
[sin 180° cos 180°][-10]
=
[-1 0][6]
[0 -1][-10]
= (-6, 10)
geser lagi, jadi :
(-6, 10) + (-2, 4) = (-8, 14)