What is the diameter of the circle?

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Look at the hyperbola graphed below. the hyperbola gets very close to the red lines on the graph, but it never touches them. which term describes each of the red lines? o o o o a. asymptote b. directrix c. focus d. axis

Which term below correctly completes the following sentence? if a function has a vertical asymptote at a certain x value, then the function is what at that value