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l = 6 cm
K = 2(14+6) = 40 cm
L = 14x6 =84cm
2 ( P + L) = Keliling
2 ( P + L ) = 40
P + L = 40/2
P + L = 20
7x + 3x = 20..>( misal x sebagai variabel Perbandingan)
10x = 20
x = 2
maka
P .. 7 x 2 = 14
L.... 3 x 2 = 6
Luas .. P X L = 14 x 6 = 84 cm²