00:01
In this question here, suppose we have the 3d space, where we have the x, y, and the z here.
00:14
And in the part a, we want to sketch the graph of the equation x square plus y square equal to the 25.
00:23
This is exactly going to be the circle in the 2d, and then we have the right as equal to 5 and the center equals to the origin.
00:32
But in the 3d, it will become the cylindrical surface and it will be the vertical surface here.
00:42
So it will be, let's say we have the 5 will be here.
00:47
5, minus 5, and it's going all the way up here.
00:52
So we have this one now.
00:55
Then we'll go down here as well.
01:05
This one will be the equation of the x square plus y square equal to 25...