Step 01 : Draw a circle or required figure as mentioned in question
step 02 : Divide in 8 or 12 parts (p1-p12)
step 03: draw a horizontal line from base (p1-p12)
step 04: draw tangents from points of circle
step 05: length of tangent should be in accordance to points
step 06 : Join all points
Done
Refer following video: