[tex] \frac{30 - 10}{90 - 10} = \frac{a - 0}{60 - 0} \\ \frac{20}{80} = \frac{a - 0}{60} \\ \frac{2}{8} = \frac{a - 0}{60} \\ 60 \times 2 = 8 \times (a - 0) \\ 120 = 8a - 0 \\ 120 + 0 = 8a \\ 120 = 8a \\ \frac{120}{8} = a \\ 15 = a \\ a = 15°Y[/tex]
Jadi, jawabannya adalah A. 15
Semoga membantu.
Sukses selalu.
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[tex] \frac{30 - 10}{90 - 10} = \frac{a - 0}{60 - 0} \\ \frac{20}{80} = \frac{a - 0}{60} \\ \frac{2}{8} = \frac{a - 0}{60} \\ 60 \times 2 = 8 \times (a - 0) \\ 120 = 8a - 0 \\ 120 + 0 = 8a \\ 120 = 8a \\ \frac{120}{8} = a \\ 15 = a \\ a = 15°Y[/tex]
Jadi, jawabannya adalah A. 15
Semoga membantu.
Sukses selalu.