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n - 3 = 360⁰/(α + 10⁰) - 1
n = 360⁰/(α + 10⁰) + 2
360/α - 1 = 360/(α + 10) + 2
360/α = 360/(α + 10) + 3
360/α = (360 + 3α + 30) / (α + 10)
360/α = (390 + 3α) / (α + 10)
360α + 3600 = 390α + 3α²
120α + 1200 = 130α + α²
α² + 10α - 1200 = 0
(α + 40) (α - 30) = 0
α = -40⁰
α = 30⁰
Karena sudut tidak mungkin negatif, maka besar α adalah 30⁰