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< SOP= < QPO =30 (dalam berseberangan)
< SRT=1/2 . SOP=15° (sudut kell=1/2. Sudut pusat)
Jawaban A <-----
[Soal 2]
L diarsi r = 3,14 (R² - r²)
= 3,14 x 100
= 314²
Jawaban B <------