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L = L
Kll = 2 . P + 2. L
84 = 2 . (4 + L) + 2 . L
84 = 8 + 2L + 2L
84 - 8 = 4L
76 = 4L
76/4 = L
19 = L
L = 19
Luas = P . L
L = 4 + 19 . 19
L = 437
84 cm : 4 = 21 cm
P = 21 cm - 2 cm + 4 cm = 23 cm
l = 23 cm - 4 cm = 19 cm
L = 23 cm x 19 cm = 437 cm²