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lebar = 21
luas = p x l = 25 x 21 = 525 cm²
92 = 2 ((4+l) + l)
92 = 2 (4 + l + l)
92 = 2 (4 + 2l)
92 = 8 + 4l
92 - 8 = 4l
84 = 4l
l = 84/4
l = 21
p = 4 + l
p = 4 + 21
p = 25
Luas = p x l
Luas = 25 x 21
Luas = 525