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P+L = 36 ---> P = 36-L
P x L = 315
36-L (L) = 315
36 -L² = 315
L² - 36 + 315 = 0 (faktorkan)
(L -15) (L- 21)= 0 (karena p> L) maka
L -15 = 0
L = 15
P= 21cm
P= 21cm ....B