Robert believes that the lengths 8 in, 13 in, and 20 in will form a triangle. Is he correct?
1. A. Yes, the sum of the two shorter sides is greater than the longest side.
2. B. Yes, the sum of the two longer sides is greater than the shortest side.
3. C. No, you have to know at least one angle measure to determine if the side lengths will form a triangle.
4. D. No, you have to know at least two angle measures to determine if the side lengths will form a triangle.