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(0,-3) dengan (0,5).
(3,-1) dengan (-3,-1)
= -3 ke 5 = 8 = diagonal 1
= -3 ke 3 = 6 = diagonal 2
Rumus = Diagonal 1 × diagonal 2 × 1/2
Luas=8 × 6 × 1/2 = 24
Bilangan yang sama di antara pasangan koordinat tidak usah dihitung.
Semoga betul