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2(20+18)= 2 x 38
= 76 cm
luas = 360 cm²
Dit= Keliling?
Penye=
Luas = p × l
360 cm² = p × 18 cm
360 cm²/18 cm = p
20 cm = p
Keliling = 2 ( p + l )
= 2 ( 20 cm + 18 cm )
= 2 × 38 cm
Keliling = 76 cm