Draw an isosceles triangle with a line segment of 4 cm long as the base, so that two such triangles fit together to form a square. What is the area of the square in cm**2.
以4cm长的线段为底画一个等腰三角形，使两个这样的三角形正好拼成一个正方形，该正方形的面积是多少cm**2．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 * 2 * (1/2) * 4</gadget>
<output>8</output>

<result>8</result>