Surface area - By tecmath
Transcript
| 00:00 | Welcome to the second surface area problem for the problem | |
| 00:04 | here . What I'm going to get you to do | |
| 00:06 | what we're gonna do is work on what is the | |
| 00:08 | total surface area of all the walls in this building | |
| 00:10 | here , excluding the windows and the doors and not | |
| 00:14 | including the windows of the doors . Alright , as | |
| 00:17 | you'll see there's about three or four rooms and we | |
| 00:19 | are going to use a bit of estimation while we're | |
| 00:21 | doing this . So the first thing you probably want | |
| 00:26 | to remember is the working area . It's just length | |
| 00:29 | times with total surface area , you just work out | |
| 00:32 | all the areas and you add them together . So | |
| 00:35 | first off with his house , we'll get rid of | |
| 00:37 | this roof , it's getting in the way and so | |
| 00:39 | what we'll do here is first thing we'll get is | |
| 00:41 | a total of all the walls . The total service | |
| 00:44 | here is going to be the surface here of all | |
| 00:45 | the walls , minus the surface area of the windows | |
| 00:48 | and doors . So the surface area of the walls | |
| 00:51 | , there's a total length of all the world's times | |
| 00:52 | the height . The height of you remember A lot | |
| 00:55 | of buildings is 2.4 m . So the first ones | |
| 00:58 | you 12.8 is two rows and there's also 8.1 m | |
| 01:04 | . Okay . Yeah , there are no one's running | |
| 01:08 | that way . Next thing I check is all the | |
| 01:10 | ones running the other way . There's a couple of | |
| 01:11 | 8.72 , 3 of them all together . There's a | |
| 01:14 | 4.7 m . Okay , once again , yeah , | |
| 01:19 | I'm converting these straight away from millimeters to meters . | |
| 01:23 | Okay , so we're going to get all these and | |
| 01:25 | we add all these together And that will be the | |
| 01:27 | total length of the walls , which is 64.5 m | |
| 01:31 | . And to work out the total area of all | |
| 01:33 | the walls will get this 64.5 At all times . | |
| 01:37 | It's by the height , which was 2.4 meters . | |
| 01:40 | Okay , so all up we get a total area | |
| 01:43 | . Total surface area 154.8 m squared . Yeah , | |
| 01:49 | that's all really good . So what we're gonna have | |
| 01:51 | to look at now these these are the measurements of | |
| 01:54 | the windows and doors . Okay , So we add | |
| 01:57 | all these together . We have to work at the | |
| 01:59 | surface area of all these windows and doors . So | |
| 02:01 | the total length of these , We'll get a times | |
| 02:05 | as far to roughly the height is roughly 2.1 or | |
| 02:08 | 1.8 m . So we're just measuring this roughly two | |
| 02:10 | m . So not 14.2 which is a total length | |
| 02:13 | of all those measurements back there . 12 to 28.4 | |
| 02:17 | m squared . Okay , so finally , the service | |
| 02:22 | area , as you see on the top there Once | |
| 02:25 | again , was the surface area , the walls . | |
| 02:27 | This 154.8 m squared . Take away the surface area | |
| 02:31 | . The windows and doors , Which was 28.4 minutes | |
| 02:35 | . Where So all of the service area is 126.4 | |
| 02:39 | m square . So the team might want to work | |
| 02:41 | out a surface area where you have lots and lots | |
| 02:43 | of lengths or the same height at all the legs | |
| 02:47 | together in times of by the height . Okay . | |
| 02:49 | And in this example here you take windows , doors | |
| 02:53 | and things like that . Okay , So next for | |
| 02:56 | what ? |
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Surface area is a free educational video by tecmath.
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