The base of an isosceles triangle is 5 cm, and the ratio of the length of the waist to the base is 5:4. What is the perimeter of the isosceles triangle in cm?
等腰三角形的底边是5厘米，腰与底长度之比是5：4，则这个等腰三角形的周长应为多少厘米．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">5 * (5/4) * 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">(25/2) + 5</gadget>
<output>35/2 = around 17.5</output>

<result>35/2 = around 17.5</result>