the extended line, draw a line parallel to the base of the triangle. extend it past the left corner.
7　from the end of the line you have just drawn, draw another line parallel to the left side of the triangle.
again, be careful about the distance between the line and the left side. make sure that it is twice the distance a shown above.
8　extend the base as shown above.
9　draw a line between the left side and the line you drew in 7.
10　draw another line down the right side. make sure that the distances between the three lines are equal as shown in the figure. you’re almost there!
11　finish your triangle by adding a 