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2( (4 + L) +L) = 92
2( 4 + 2L) = 92
8 + 4L = 92
4L = 84
L = 84/4 =21
P = 21+4 = 25
Luas = P x L = 25 x 21= 525 cm²
K= 2(P+l)
92=2(4+l+l)
92=2(4+2l)
92=8+4l
92-8=4l
84=4l
21=l
p=4+21=25
l=21
L=P*L=25*21=525