First,draw these 6 straight lines.
Second,Take the 1st row middle and match it to the 2nd row last like this...
The 1st row first line match it to the 2nd row second line. Easy to remember!
1st row,third line match to the 1st part that u did it.Do the same for the empty part
Draw triangle at he top and bottom.
Video!!! (If u don't understand)