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80= 10 x l
l= 80:10
l= 8cm
K= 2 (p+l)
K= 2 ( 10 + 8)
K= 2 x 18
K= 36cm
Untuk mencari lebarnya =
80cm² : 10 = 8 cm
B. Rumus keliling persegi panjang: 2 × (p+l)
Jadi,
2 × (10+8)
2 × 18 = 36 cm
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