Here is a regular pentagon.
Calculate the size of the interior angle marked \( c \).
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Answer

\( \text{size of interior angle} = \frac{\text{sum of interior angles}}{n} \)

Steps

Step 1 ：\( n = 5 \)

Step 2 ：\( \text{sum of interior angles} = (n - 2) \times 180 \degree \)

Step 3 ：\( \text{size of interior angle} = \frac{\text{sum of interior angles}}{n} \)