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28 = 2l + 2l + 4
28-4 = 4l
24 = 4l
l = 24÷4
= 6
p = 6 + 2
= 8
Luas = p × l
= 8×6
= 48 cm²
k = 2p+ 2l
28 = 2(a+2)+2a
28= 2a+4+2a
28-4=4a
24=4a
a=6
p=2+a
= 2+6=8
l= p.l
l= 8. 6
l= 48