Even though two-column proofs have been around forever and every single geometry student uses them, mathematicians write narrative (sentences in a paragraph) when proving new theorems. Watch as professor and mathematician Edward Burger takes a standard two-column proof and converts it to a narrative or paragraph proof. This video is from Thinkwell's award-winning Geometry course. See www.thinkwellhomeschool.com for more videos like this one along with exercises, worksheets, quizzes, notes, and more!