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38 = 2 (5+l+l)
38/2 = 5 + 2l
19 = 5 + 2l
2l = 14
l = 14/2
l = 7 cm
p = 5+l
p = 5+7
p = 12 cm
L = pxl
L = 12 x 7
L = 84 cm2