The base length of an isosceles triangle is 30 cm, and the waist length is 50 cm. Find its perimeter?
一个等腰三角形的底边长30厘米，腰长50厘米，求它的周长？
<gadget id="calculator">30 + 50 + 50</gadget>
<output>130</output>

<result>130</result>