Andrew Del Valle
Step 1. Insert line segment
Step 2. Create perpendicular lines on both ends of the segment
Step 3. Create a circle starting from one end point and ending at the other (repeat twice for both ends of the segment)
Step 4. Create a line segment from the original line segment to the top of the circle made. (repeat this for both end points)
Step 5. hide the lines of construction so you only have the square shape.