Semicircle perimeter = \(\pi r + 2r = r(\pi + 2)\).<br><br>From the figure, the radius \(r = 70\) cm.<br><br>Using \(\pi = \frac{22}{7}\):<br>\(70 \times (\frac{22}{7} + 2) = 70 \times \frac{36}{7} = 360\) cm.<br><br>Final Answer: 360 cm