There is an isosceles triangle, the ratio of the apex angle to the base angle is 2:1, and the three sides of this triangle are 1.5 decimeters, 1.5 decimeters and 2.2 decimeters. What is the area of this triangle in square centimetres.
有一个等腰三角形，顶角和底角的度数之比是2：1，这个三角形的三条边分别是1.5分米，1.5分米和2.2分米．这个三角形的面积是多少平方厘米．
<gadget id="calculator">1.5 / 2</gadget>
<output>0.75</output>

<gadget id="calculator">1.5 * 0.75 * 100</gadget>
<output>112.5</output>

<result>112.5</result>