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mungkin 32-14 untuk panjang yg lain gtw
32 = (2x+5)+(2x-1)+(2x+5)+(2x-1)
32 = 8x + 8
32-8 = 8x
24 = 8x
24/8 = x
3 = x
p= 2x+5
= 2 (3) +5 = 11
l=2x-1
=2 (3)-1
=5
L = p×l
= 11× 5 = 55
thanks