To find the percent error of a measurement, you typically need to know both the measured value and the true or accepted value. The formula for percent error is:
\[ \text{Percent Error} = \left( \frac{|\text{True Value} - \text{Measured Value}|}{|\text{True Value}|} \right) \times 100% \]
In this case, you only provided the measurement of 0.2 cm, but you need the true value to calculate the percent error. If we had a true value (let's say 1 cm for the sake of an example), we would calculate it as follows:
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Assume the true value is 1 cm (for example).
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Measured value = 0.2 cm.
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Calculate the error:
\[ \text{Error} = |\text{True Value} - \text{Measured Value}| = |1 - 0.2| = 0.8 \text{ cm} \]
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Calculate the percent error:
\[ \text{Percent Error} = \left( \frac{0.8}{1} \right) \times 100% = 80% \]
Without knowing the true value, we can't definitively say which of the options A, B, or C is correct. If you provide a true value, I can help you find the accurate percent error.
If you have values for the true measurement, please share them for a clearer calculation.