The two sides of an isosceles triangle are 5 decimeters and 10 decimeters respectively. What is the perimeter of this triangle?
一个等腰三角形的两条边分别是5分米、10分米，这个三角形的周长是多少分米．
<gadget id="calculator">10 + 10 + 5</gadget>
<output>25</output>

<result>25</result>