There is an isosceles triangle, the two adjacent sides are 7 cm and 3 cm long respectively, what is the perimeter of this triangle in cm?
有一个等腰三角形，相邻两条边分别长7厘米和3厘米，这个三角形的周长是多少厘米．
<gadget id="calculator">7 + 7 + 3</gadget>
<output>17</output>

<result>17</result>