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Bagian Pertama 20 cm.
⇒ 20 cm ÷ 4 sisi = 5cm
1 sisinya 5cm.
Luas= 5 × 5
= 25cm²
Bagian Kedua 16 cm.
⇒ 16 cm ÷ 4 sisi = 4cm
1 sisinya 4cm.
Luas= 4 × 4
= 16cm²
Maksudnya begitu kan?