Step #1
Draw triangle as shown.
Step #2
Draw line as shown.
Step #3
Draw inner line as shown.
Step #4
Draw outline for shape as shown.
Step #5
Draw line as shown.
Step #6
Draw line as shown.
Step #7
Draw line as shown.
Step #8
Enhance drawing.
Step #9
Enhance drawing.
Step #10
Enhance drawing.
Step #11
Draw shape as shown.
Step #12
Enhance drawing.
Step #13
Make necessary improvements to finish.