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360 cm² = alas x 15 cm
alas = Luas : Tinggi
Alas = 360 cm² : 15 cm
Alas = 24 cm = b
30) keliling = semua sisi dijumlahkan
Kll = a + b + c + d + e + f
Kll = 8 + 4.5 + (8-3.5) + (7.5 - 4.5) + 3.5 + 7.5
Kll = 31 cm = d