If the sides of an isosceles triangle are 1.5cm and 3.5cm, what is the perimeter of the triangle?
一个等腰三角形的两边长为1.5cm和3.5cm，则这个三角形的周长是多少．
<gadget id="calculator">3.5 + 3.5 + 1.5</gadget>
<output>8.5</output>

<result>8.5</result>