One side of an isosceles triangle is 6 cm long and the other side is 3 cm long. What is the perimeter of the triangle in cm?
一个等腰三角形一边长6cm，另一边长3cm，这个三角形的周长是多少cm．
<gadget id="calculator">6 + 6 + 3</gadget>
<output>15</output>

<result>15</result>