•Cermin
»Bagian a.
Dik:
- α = 30°
Dit:
- n = ?
Jawab:
n = (360°/α) - 1
n = (360°/30°) - 1
n = 12 - 1
n = 11 buah
»Bagian b.
- n = 7 buah
- α = ?
7 = (360°/α) - 1
7 + 1 = 360°/α
8 = 360°/α
α = 360/8
α = 45°
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•Cermin
»Bagian a.
Dik:
- α = 30°
Dit:
- n = ?
Jawab:
n = (360°/α) - 1
n = (360°/30°) - 1
n = 12 - 1
n = 11 buah
»Bagian b.
Dik:
- n = 7 buah
Dit:
- α = ?
Jawab:
n = (360°/α) - 1
7 = (360°/α) - 1
7 + 1 = 360°/α
8 = 360°/α
α = 360/8
α = 45°