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alas = 57-20-19 = 18
tinggi = 51-28= 23
= 1/2. a.t
=1/2. 18 × 23
=1/2.414
=207
persegi panjang
panjang = 57
lebar = 28
= p.l
= 57 × 28
= 1606
jadi, 1606 + 207 = 1713