tolong bantu yg nomer 12 sama 16 pake caranya ,,pliss lgi butuh bgt

12. Jawaban = D
Pembahasan:
5x - 6 cm = 2x + 12 cm
5x - 2x = 12cm + 6cm
3x = 18cm
x = 6 cm

2x + 12cm = 2×6cm + 12cm
= 12cm + 12cm
= 24cm

13. Jawaban = B

Pembahasan:

Sudut EGH = Sudur EGF = 50°
Sudut EFH = Sudut EHF = 70°

Sudut HFG
= 180° - 90° - 50 °
= 40°

Sudut EFG
= Sudut HFG + Sudut EFG
= 40° + 70°
= 110°

maaf kalau salahh semoga membantu