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L= 180 cm2
ditanya : keliling persegi panjang tsb?
dijawab : L= p×l
180 = 15 × l
180 = 15l
l = 180/15
l = 12 cm.
Keliling = 2 (p+l)
keliling = 2 (15 +12)
keliling = 2 (27)
keliling = 54.
mohon koreksinya.. semua membantu.