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coba diitung
34 = 2(p+l)
34:2 = p+l
17 = p+l ----> p = 17-l
L = p.l
60 = p.l ------> p.l = 60
(17-l).l = 60
17l-l²-60 = 0
kdua ruad kalikan dg (-1), mnjadi :
l²-17l+60 = 0
b) l²-17l+60 = 0
(l-5)(l-12) = 0
l-5 = 0 atau l-12 = 0
l = 5 cm l = 12 cm
utk l = 5 cm , maka : p = 17-l = 17-5 = 12 cm
utk l = 12 cm , maka : p = 17-l = 17-12 = 5 cm