If the perimeter of the base of a cuboid is 15 cm and the height is 4 cm, what is the sum of the lengths of its sides in cm?
一个长方体的底面周长是15厘米，高是4厘米，它的棱长总和是多少厘米．
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">30 + 16</gadget>
<output>46</output>

<result>46</result>