A triangle has three sides that add up to 180 degrees. Let’s set up an equation to model this question.
16+4+x=180
20+x=180
Subtract 20 to both sides.
x=160.
You use that Pythagorean Theory which is A^2+B^2=C^2. 16^2 is 256 and 4^2 is 16. Then you add those together and you should have 272 and you square root that and your answer is 6
