You wrote: I am 12 and I can't figure out my homework.If the lengths of two sides of a triangle are 4 cm and 6 cm what is the least and greatest possible length of the third side? What is the formula for figuring this out?
Rather then give you the answer, I will suggest a way to figure it out. There is no formula, per se. Take a straw or strip of paper and cut pieces 4 cm and 6 cm. Attach at one end so that they will swivel. When you make the smallest possible angle between the two pieces, you will get the least possible length. When you make the largest possible angle between the two pieces that is less than or equal to a straight angle, you will get the greatest possible length.
You could probably draw the two extremes without using the straw pieces, but it always helps me to actually move things.