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segitinga : t = 51-28 = 23 cm
a : 57-20-19= 18 cm
l = 1/2 . a . t = 1/2 . 18 . 23 = 208 cm
persegi panjang : L = P . L
= 57 . 28 = 1596 cm
1596 + 207 =1803 cm