Surface area - By tecmath
Transcript
| 00:00 | Hello and welcome to my video on surface area . | |
| 00:04 | The problem is going to be dealing with here is | |
| 00:07 | working at the surface area of the walls of a | |
| 00:10 | house . Take into consideration and taking away the surface | |
| 00:14 | area is contained by the doors and the windows . | |
| 00:17 | You had the problem that you might get . So | |
| 00:18 | you're painting the house and you have to work out | |
| 00:20 | how much area actually had to paint . Okay , | |
| 00:23 | so without much further ado , we're going to have | |
| 00:26 | a look at this . First of all , we're | |
| 00:27 | going to have a look at this one here , | |
| 00:29 | 6.5 or 2.4 m at the window in there . | |
| 00:33 | Okay , so first thing I do generally is I'd | |
| 00:35 | make a little sketch of that And area here is | |
| 00:38 | that 6.5 by 2.4 m . Take away the area | |
| 00:42 | for the window , which is 2.5 m by 1.8 | |
| 00:46 | . Okay , working that out becomes 15.6 m squared | |
| 00:51 | . Take away 4.5 m sweat . Excuse us . | |
| 00:54 | The answer Pull up of 11.1 m where ? Okay | |
| 01:00 | , so the next thing we do is have a | |
| 01:04 | look at the next wall . Okay , I look | |
| 01:06 | directly over the opposite wall . So this wall also | |
| 01:10 | Is going to be 6.5 m By 2.4 m . | |
| 01:14 | So the area this wall is going to be against | |
| 01:17 | 6.5 m . m . Yes . They're giving us | |
| 01:21 | 15.6 m . Okay , nice . Easy one . | |
| 01:24 | There's nothing to take away . So we'll have a | |
| 01:27 | look at the wall coming up next , Which is | |
| 01:31 | a wall which measures 7.2 m by 2.4 m . | |
| 01:36 | Okay , so I've drawn it once again . The | |
| 01:39 | area 7.2 m times 2.4 m , which gives me | |
| 01:44 | the answer of 17.28 m square . Okay , now | |
| 01:51 | I have the wall directly opposite there . So , | |
| 01:54 | this wall here measures 7.2 m by 2.4 m and | |
| 01:58 | has a little area For a door , which is | |
| 02:00 | .9 m by 2.1 m . So the area This | |
| 02:05 | wall here is 7.2 - four , which is 17.28 | |
| 02:09 | m squared . Take away the area . The door | |
| 02:11 | , which is 2.10.9 , Which is 1.89 m . | |
| 02:16 | So 17.2819 , m squared . Okay , so we've | |
| 02:24 | worked out all the areas of the walls , take | |
| 02:27 | away the areas that we're not going to be looking | |
| 02:29 | at windows and the doors . So all we need | |
| 02:32 | to do now is total . So we had up | |
| 02:35 | 11.1 , 17.28 , Get the answer of 59.37 m | |
| 02:42 | square . Sorry . That's how you're working out surface | |
| 02:46 | area . It's a matter of working out the area | |
| 02:49 | of each surface you're looking at , and then just | |
| 02:52 | simply adding them together , taking away the little things | |
| 02:55 | that you don't need . Okay , we're going next | |
| 02:57 | up , we're going to have a look at a | |
| 02:58 | little bit more complex version of this . What we | |
| 03:01 | do is we actually had multiple rooms we're trying to | |
| 03:03 | work out secretary for and a little shortcut that you | |
| 03:07 | may go by . |
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Surface area is a free educational video by tecmath.
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