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2(p+l) = 26
2p+8 = 26
2p = 18
p = 9
Luas = pxl
= 9 x 4
= 36 m²
26=2 (p+4)
26= 2p + 8
-2p= -26+8
-2p= -18
p = -18/-2
p = 9
L.persegi pj = p.l
= 9.4
= 36