An isosceles triangle, the lengths of the two sides are 3 cm and 7 cm respectively, what is its perimeter in cm
一个等腰三角形，两条边的长度分别是3厘米，7厘米，那么它的周长是多少厘米
<gadget id="calculator">3 + 7 + 7</gadget>
<output>17</output>

<result>17</result>