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✉️ Why is the area of a circle π·r² (pi r squared)? – 🥇 Scalar Scientific Calculator App, Charts & Scripts
prove that [2 pie r=n lambda] the circumference of the bohr orbit for the hydrogen atom is an integral multiple of the de brogli wavelength
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Why is 2πr the circumference of a circle if it means 2 x π x r instead of πd which is the formula I learned for circumference? - Quora
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