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180 derajat = 9x
x = 180/9
x = 20
4x = 4*20
= 80 derajat
5x = 5*20
= 100 derajat
Jawabannya yg A.100 derajat
Semoga bermanfaat dunia akhirat
>> Tandai terbaik jika membantu
sudut b=5/9×180 = 100
jawaban A