From Peak Voltage:
$$ V_{rms} = \frac{V_p}{\sqrt{2}} \approx 0.707 \cdot V_p $$
From Peak-to-Peak Voltage:
$$ V_{rms} = \frac{V_{pp}}{2\sqrt{2}} \approx 0.354 \cdot V_{pp} $$
From Average Voltage:
$$ V_{rms} = \frac{\pi}{2\sqrt{2}} \cdot V_{avg} \approx 1.111 \cdot V_{avg} $$
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