One angle of a right triangle is 45°, and its longest side is known to be 12 cm, what is the area of the triangle in square centimeters?
一个直角三角形中有一个角是45°，且已知它的最长边长为12厘米，这个三角形的面积是多少平方厘米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<result>36</result>