tolong di bantu ya pakai cara no 6-8 makasih yaa

7. CB² = 6² + (20 - 12)²
CB² = 6² + 8²
CB² = 36 + 64
CB² = 100
CB = √100
CB = 10 cm

Keliling = 20 + 10 + 12 + 6
= 30 + 18
= 48 cm (C)

maaf cuma bsa jwb yg saya bsa