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jadi K=2(10+2) = 24
cm. jika perbandingan panjang dan lebar adalah 5:1, hitung keliling persegi
panjang tersebut
diket:
p = 5x = 10 cm
l = 1x
ditanya : keliling
p = 5x = 10
x = 10/5 = 2
l = 1x = 1.5 = 5 cm
keliling = 2 (p + l )
= 2 (10 + 5 ) = 30 cm