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Verified answer
DiketahuiP = 12 + L
K = 60 cm
Ditanya
Nilai panjang & lebar
Jawaban
K = 2(P + L)
60 = 2( 12 + L + L)
60/2 = 12 + 2L
30 - 12 = 2L
18 = 2L
18/2 = L
9 = L
Jadi Lebar = 9 cm, sedangkan panjangnya adalah :
P = 12 + L
P = 12 + 9
P = 21 cm
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