WEBVTT
00:00:01.200 --> 00:00:02.650
Find the volume of the cylinder.
00:00:02.680 --> 00:00:06.040
Give your answer in inches cubed to one decimal place.
00:00:06.600 --> 00:00:13.410
In order to find the volume of a cylinder, we need to multiply π the radius squared and the height altogether.
00:00:13.790 --> 00:00:16.390
So π will be a button that we can press on our calculator.
00:00:16.430 --> 00:00:19.660
However, we need to find the radius and the height of the cylinder.
00:00:20.150 --> 00:00:25.080
The radius will go from the center of the circle to a point on the circle.
00:00:25.540 --> 00:00:28.460
So itβs exactly half of that 14 inches.
00:00:28.460 --> 00:00:31.400
And the 14 inches represent a diameter.
00:00:31.600 --> 00:00:36.390
So to find the radius, we need to cut 14 inches in half β so divide by two.
00:00:36.780 --> 00:00:38.680
So the radius is seven inches.
00:00:39.240 --> 00:00:42.580
And remember itβs the radius squared or multiplied by.
00:00:43.470 --> 00:00:46.010
And now we need to multiply by the height of the cylinder.
00:00:46.330 --> 00:00:48.130
And the height of the cylinder is 13.
00:00:48.660 --> 00:00:52.860
Before multiplying these numbers together, we need to square seven.
00:00:53.570 --> 00:01:00.040
And seven squared is 49 and we get 2001.1945.
00:01:00.590 --> 00:01:02.820
Now, it says to round to one decimal place.
00:01:02.850 --> 00:01:08.340
So we need to look at the number to the right and decide if we will keep the 1.1 or round it up to a two.
00:01:09.030 --> 00:01:13.800
And since nine is five or greater, we will round the one up to a two.
00:01:14.480 --> 00:01:19.690
Therefore, the volume of this cylinder would be 2001.2 cubic inches.