What is the area of an isosceles right triangle with a height of 4 cm at the base?
一个等腰直角三角形，底边上的高为4厘米，那么它的面积是多少平方厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>8</result>