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k = 2p + 2l
52 = 2(4+l) + 2l
52 = 8 + 2l + 2l
52 = 8 + 4l
4l = 52 - 8
4l = 44
l = 44/4
l = 11 cm

p = 4 + l
p = 4 + 11
p = 15 cm

L = p x l
L = 15 x 11
L = 165cm²

keliling = 52 cm
misal:
panjang = p
lebar : l

p = 4 + l (1)

K = 2(p + l)
52 = 2(p+l)
52/2 = p + l
26 = p + l (2)

substitusi 1 ke 2

26 = p + l
26 = 4 + l + l
26 = 4 + 2l
26 - 4 = 4 - 4 + 2l
22 = 2l
22/2 = l
11 = l

p = 4 + l
p = 4 + 11
p = 15 cm

Luas = p × l
= 15 × 11
= 165 cm persegi (C)