In a triangle, the ratio of the three interior angles is 1:1:2. It is known that the two sides are (4/7) centimeters and (4/5) centimeters long respectively. What kind of triangle is this triangle? What is its area in square centimeters?
一个三角形，三个内角度数的比是1：1：2，已知其中的两条边分别长(4/7)厘米和(4/5)厘米，这个三角形是什么三角形？它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">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(1/2) * (4/7) * (4/7)</gadget>
<output>8/49 = around 0.163265</output>

<result>8/49 = around 0.163265</result>