 Welcome, geometry students, as we work with the converse of the Pythagorean theorem once again. Have your paper and pencil ready and follow along? The first part is to answer the question, is it a triangle? Our triangle has three side lengths, four and four and eight. We're going to compare the two shortest sides, four and four, add them together, and we get a sum of eight. We compare that to the third side, which is also eight. So we find that the two side lengths together do not add up to more than the third side. Eight is not greater than eight, so you can write the greater than symbol with a slash through it, which means not greater than. So if the two shorter sides are not bigger than the third side, you do not have a triangle, which is great. You can simply answer it with not a triangle, and you don't even have to do part b. You can't classify it if it is not a triangle. So to quickly review, we took these two shorter sides, four and four, and we compared them to the third side. So four and four added up to eight, not greater than the third side, eight, not a triangle.