Use a square red paper with a side length of 90 cm to make a small red flag with a right-angled triangle with a base and a height of 5 cm. How many sides can you make at most?
用一块边长90厘米的正方形红纸，做底和高都是5厘米的直角三角形的小红旗，最多可以做多少面．
<gadget id="calculator">90 * 90</gadget>
<output>8_100</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">5 * (5/2)</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">8_100 / (25/2)</gadget>
<output>648</output>

<result>648</result>