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b. 180° - 98,5° = 81,5°
2. a. 90° - 25° = 65°
b. 90° - 89,2° = 0,8°
3. a. Yang a sudah benar ✔
b. karena sudutnya bertolak belakang dengan AOB jadi sepertinya jawabannya 42°
c. 48°
d. ✔
e. ✔