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d2 = 8 cm (lihat diagonal persegi, diagonal persegi = d2)
luas = 1/2 d1.d2
= 1/2 18 . 8
= 9 . 8
= 72 cm²
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16.
luas = 1/2 d1 d2
= 1/2 18 . 20
= 18 . 10
= 180 cm²