One angle of a right triangle is 45° and the longest side is 10 cm. What is the area of the triangle?
直角三角形的一个角是45°，最长的边长是10厘米，这个三角形的面积是多少．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">10 * (5/2)</gadget>
<output>25</output>

<result>25</result>