You obviously drew an isosceles triangle, and measured the two side lengths of this isosceles triangle to be 12 cm and 5 cm respectively. What is the perimeter of this triangle in centimeters?
明明画了一个等腰三角形，量出这个等腰三角形两条边长分别是12厘米和5厘米，这个三角形的周长是多少厘米？
<gadget id="calculator">12 + 12 + 5</gadget>
<output>29</output>

<result>29</result>