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P = 2L
Keliling = 2( P + L)
80 = 2 (2L + L)
40 = 3L
L = 40/3cm
P = 2 x 40/3 = 80/3
Luas = P x L
= 80/3 x 40/3
= 3.200/9
=355,56 cm2
maka (2x+x)2=80
x=13,3
panjang : 26,6
lebar: 13,3
luas :panjang x lebar
26,6x 13,3
=355,11