In a triangle, it is known that the ratio of the three interior angles is 1:1:2, and the length of the longest side of the triangle is 4cm, then what is the area of the triangle in cm**2.
在一个三角形中，已知三个内角之比为1：1：2，且这个三角形最长的边长为4cm，那么这个三角形的面积是多少cm**2．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<result>4</result>