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4 S = 120
S = 30 cm
(1/2D1)² + (1/2D2)² = S²
(18)² + (1/2D2)² = 30²
324 + (1/2D2)² = 900
(1/2D2)² = 576
1/2D2 =√576 = 24
D2 = 48
1/2 x D1 x D2 = Luas Ketupat
1/2 x 36 x 48 = 864 cm²