The two sides of an isosceles triangle are 8 cm and 4 cm respectively, what is its perimeter in cm
一个等腰三角形的两条边分别是8厘米和4厘米，它的周长是多少厘米
<gadget id="calculator">4 + 4 + 4 + 4 + 4</gadget>
<output>20</output>

<result>20</result>