If the lengths of the two sides of an isosceles triangle are 3 cm and 6 cm respectively, what is the perimeter of the isosceles triangle in cm?
一个等腰三角形两条边的长度分别是3厘米、6厘米，这个等腰三角形的周长是多少厘米．
<gadget id="calculator">6 + 6 + 3</gadget>
<output>15</output>

<result>15</result>