00:01
This problem gives us the flu virus that looks something like this.
00:10
And the flu virus has a diameter of 0 .000000 to m.
00:23
So it wants us to write this in scientific notation and then estimate the area of a typical flu virus.
00:30
So define the scientific notation, we take our diameter that we have.
00:37
And then we're going to move this decimal until it is one past the first number.
00:44
So one, two, three, four, five, six, seven.
00:49
So now, in scientific notation, this is going to be two point zero times ten to the negative seventh, because we moved it seven places.
01:00
Now, to find the area of the circle, now to find the area of this flu rise, we have to find the radius.
01:12
The area of a circle is pi r squared.
01:18
It gives us a diameter, but to find the radius, it's half of the diameter...