Question

Around which line would the following cross-section need to be revolved to create a sphere?

A. y-axis
B. y = 1
C. x = 2
D. x = 1

Answer 1

What do you think could be the correct answer? Also do you know which ones could be the correct answers?

Answer 2

"*Also do you know which ones could be the correct answers?*" if she/he did why would they be askin'? 🤔

Answer 3

This requires a little bit of visualizing in your head

Imagine taking a flat, circular piece of paper and having it revolve infinitely along its axis. You’ll produce a sphere.

(I’ll attach an image that gives you some idea of how it looks. This is a semicircle, but the same idea applies for a circle revolved around its axis)

So looking at your circle, where would the appropriate axis be?

Answer 4

I think that the appropriate axis would be at the y-axis.

Answer 5

Perfect, that’s where the diameter of the circle is, so y-axis is correct

Answer 6

Oh thank you so much!