Gunakan rumus rotasi 90°: ( (x, y) \to (-y, x) ) [ M(3, -7) \to M'( -(-7), 3) = (7, 3) ]
Pada rotasi, "searah jarum jam" berarti sudut negatif ( -90∘negative 90 raised to the composed with power ), sedangkan "berlawanan arah" berarti sudut positif ( +90∘positive 90 raised to the composed with power Soal Transformasi Geometri Kelas 9