There is an isosceles triangle, the degree ratio of the top angle to the bottom angle is 2:1, the three sides of this triangle are 1 decimeter, 1 decimeter, and 1.42 decimeters respectively, what is the area of this triangle in square centimeters?
有一个等腰三角形，顶角和一个底角的度数比是2：1，这个三角形的三条边分别是1分米、1分米、1.42分米，这个三角形的面积是多少平方厘米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) * 100</gadget>
<output>50</output>

<result>50</result>