Measurement - Perimeter made easy! - Free Educational videos for Students in K-12

Measurement - Perimeter made easy! - By tecmath

Transcript


00:0-1	Good day and welcome to take Math Channel . What
00:02	we're gonna be having a look at in this video
00:03	is a really quick video . Looking at the concept
00:05	of perimeter , uh the perimeter , the distance around
00:09	the outside of the shape . Okay , so without
00:12	much further ado let's just launch straight into it .
00:14	So , say you were asked to work out the
00:15	perimeter of this shape ? Yeah . Ok . And
00:19	I'll draw on for you right now , a lovely
00:21	little rectangle , fairly rough one . But it will
00:25	suffice to say . I asked you to work at
00:28	the perimeter of this on this side here Measured up
00:30	and it was five cm and this site here was
00:34	three cm . So the way that you would go
00:37	to work at the perimeter is we want to work
00:39	at the distance around the outside of the shape .
00:43	Okay , so the total distance to this side plus
00:45	this side , this side , this side . So
00:48	the first step is you put on the unknown side
00:51	. So we have this side here . Right now
00:53	we have this site here written down but there's two
00:55	sides . We don't know but it's fairly simple because
00:58	a rectangle we're going to see here . This length
01:01	is here is the same as this length here .
01:03	So this is 5cm And this length here is the
01:08	same length as this length here . So this is
01:11	three cm and the perimeter . So the perimeter is
01:18	the total distance around the outside . So it equals
01:23	as follows . Articles . Usually what I do is
01:26	I'd actually by on this and I've had in a
01:29	particular direction . I'd like to head in a clockwise
01:32	direction when I do this but it's really really worth
01:34	marking . On First off we have five sentiments plus
01:42	three . Sina means plus five centimeters plus three centimeters
01:52	. Okay , this is all centimeters five plus three
01:55	plus five past three . Then we get the answer
01:59	of five right 13 16 and this is in centimeters
02:06	really important for that unit . And that's how you
02:09	work out the perimeter . Just add them up .
02:11	Really good little hit though to mark on where you
02:13	started and you're possibly if you get really stuck with
02:16	mark on the lines issue are adding them . Anyway
02:20	. What about we do a different type of shape
02:25	. Let's work out the perimeter of the following .
02:28	Um So what about I do this shape here ,
02:32	which is a tropical . Yeah . Okay . Now
02:40	put some distance is on this . This side here
02:43	is seven centimetres . This one here I'm going to
02:48	use a bit of a nasty one . I'm going
02:49	to Change this 1-7 35 millimeters . And this one
02:58	here is for centimeters we have all the sides here
03:02	. Now you'll notice this but we have a problem
03:06	. And this is this . we actually have a
03:08	using centimeters in a couple of our measurements and millimeters
03:11	in one . So the second step after getting all
03:14	the side length is making sure all the units are
03:17	the same type . So this should be in centimeters
03:21	. What you might remember from other videos were made
03:24	, is that one cm is 10 millimeters . Okay
03:33	, so that's what it's equal to . So You
03:36	might even have that little table the way we work
03:38	that out , a little diagram . But literally what
03:40	we're gonna have to do is we're going to divide
03:42	this answer by 10 . So this becomes We're gonna
03:46	get rid of that there and this is going to
03:48	become seven 0.5 centimeters . Okay , so the perimeter
03:56	is gonna be just all these sides added together .
03:59	So start in there and I'm gonna go in this
04:02	clockwise direction . So I'm gonna add 7 7.54 .
04:07	So the perimeter equals seven boss 7.5 boss 454 And
04:22	we add these together . This is all going man
04:24	centimeters seven plus 7.5 is 14.5 plus 4 , 18
04:33	0.5 cinnamon . Okay , how did you go with
04:39	that now ? What's gonna put one last shape up
04:41	here and it's going to be a bit more of
04:43	a difficult shape this time . So the shape we're
04:48	going to put up is it's not going to be
04:50	too difficult . I won't make it too crazy ,
04:53	but it's going to look like this . Okay .
05:03	And I put the sides on these . Yeah ,
05:06	I put some sides on that unknown . Just a
05:09	various . Because this is another type of problem you
05:12	might have given . So say this one here is
05:15	seven centimetres . This one here is all right ,
05:21	that All right out like this is seven cm .
05:25	This one here is Uh huh . three cm .
05:29	I'm sorry . This is not the scale . This
05:31	one here is four centimeters . This one here is
05:39	six centimeters . And you were given this to work
05:42	out the perimeter . Now first off , what we
05:45	do is we make sure all sides , Right ?
05:48	So we have his side . We have this side
05:52	, we don't have this side . So it's worth
05:53	mark here sort of go around and check that you
05:56	have and so you have this one , you don't
05:57	know this . Once in a market , this one
05:59	we have this one we have is what we don't
06:01	see the market and this one we do have .
06:03	Okay , so let's work out the ones we don't
06:06	know . Yeah , there's a bit of a trick
06:09	for doing this . And first off , we want
06:11	to know this one here from here to hear .
06:15	So the way that we do this is as follows
06:17	, we know that from here to here is seven
06:21	and from here to here is six . So this
06:25	word is one more centimeter than this one here .
06:30	This extra bit would total the distance . So this
06:33	one here plus this one here would be a good
06:35	seven . So this +16 so it makes this one
06:38	here one centimeter . Okay , we have this other
06:43	one down here , Okay ? And we know that
06:46	this one is as big as three and four centimeters
06:49	put together . So this one seven centimetres So now
06:53	we have all our sides we can add them ,
06:55	they're all the same unit . So everything's good there
06:58	. Let's work out the perimeter so to start here
07:01	and I'm just gonna basically jot them down as I
07:05	see them . So we're equals three plus one plus
07:10	46 By seven x 7 . So we're gonna be
07:15	adding all of these that's all going to be in
07:21	centimeters . Okay , so three plus one is four
07:25	Plus four is 8 plus six is 14 Plus seven
07:31	is 21 plus seven . Pickles . 25 said to
07:38	me . So how'd you go with those ? Hopefully
07:41	you're pretty good with the idea of perimeter . So
07:43	perimeter , just the distance around the outside and there's
07:45	just a few little tricks that I've given you there
07:48	of things you might get asked when you're asked to
07:50	work out perimeter . I hope there was some help
07:53	. Thanks a lot for the next one .

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