Question 1049916
*[tex \ \overline{SK}] = *[tex \ \overline{KS}]  
*[tex \ \overline{LS}] = *[tex \ \overline{SL}]  
*[tex \ \overline{KS}] + *[tex \ \overline{SL}]  = *[tex \ \overline{KL}] 
 *[tex \ \overline{KL}] = *[tex \ \overline{LK}]