Plant trees at equal intervals around a triangular site with lengths of 48 meters, 72 meters and 86 meters respectively. How many trees are planted in total?
在一个长分别为48米，72米，86米的三角形场地周围按相等间隔栽树，共栽多少棵树．
<gadget id="calculator">48 + 72 + 86</gadget>
<output>206</output>

<gadget id="calculator">206 / 2</gadget>
<output>103</output>

<result>103</result>