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=2 kali (35+15)
= 2 kali 50 =100 cm
2. kell. persegi panjang = 2 kali (p+l)
= 2 kali (12+18)
=2 kali 30= 60 cm
3. kell. persegi panjang = 2 kali (p+l)
= 2 kali (16+15)
=2 kali 31 = 62 cm