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L+ (2L+1) = 16
3L = 16-1
3L = 15
L = 5
p =2L+1 =2. 5+1 = 11
luas = p.l = 5.11 =55
menurut saya jawabannya 55. maaf kalo salah. maaf kalo beda dari pilihan a,b,c,d nya