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J(-1,-3) → T(3,0)----->> J'(-1+3 , -3+0) = J'(2,-3)
K(2,-1) → T(3,0)------>> K'(2+3 , -1+0) = K'(5,-1)
Kemudian direfleksi di y = 1 :
rumus dasar : P(x,y) ---->> P'(x,2a-y)
I'(0,-2) ------->> I"(0 , 2.1 + 2) = I"(0,4)
J'(2,-3) ------>> J"(2 , 2.1 - 3) = J"(2,-1)
K'(5,-1) ------>> K"(5 , 2.1 + 1) = K"(5,3)