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Kliling = 4 sisi
'y' = 4(4y +1)
b.
luas = Sisi²
'y' = (4y+1)²
c. Kliling = 4(4y+1) = 4(4.5+1)= 4(21) = 84 cm
Luas = (4y+1)² = (21)² = 441 cm²