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Verified answer
K = 30 cmlebar = l
panjang = 3 + l
k = 2(p + l)
30= 2(3 + l + l)
30= 2(3 + l)
30 = 6 + 2l
30 - 6 = 2l
24 = 2l
24/2 = l
12 = l
L = p.l
= (3 + l ) .l
= (3 + 12) . 12
= 15.12
=180 cm²
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