1 00:00:01,070 --> 00:00:04,969 Hello! We are going to start the marvelous world of tangents. 2 00:00:05,450 --> 00:00:10,949 Doing these exercises, draw an external tangent circumference to the given one. 3 00:00:11,109 --> 00:00:14,509 The given one is this, in a specific point. 4 00:00:15,029 --> 00:00:16,190 This is the point, okay? 5 00:00:16,530 --> 00:00:20,769 So we have to draw a circumference outside this one 6 00:00:20,769 --> 00:00:25,109 that touches this circumference only in this point, okay? 7 00:00:25,410 --> 00:00:28,210 It doesn't cut it, just touches it, okay? 8 00:00:28,210 --> 00:00:35,909 So what we need to do first of all is to join the center of the circumference with the point of tangent. 9 00:00:36,250 --> 00:00:41,310 We have to make a line that passes through those two points. 10 00:00:41,929 --> 00:00:46,130 We can do the line with the ruler or with the square, as I'm doing. 11 00:00:47,929 --> 00:00:55,689 So the solution, the circumference that we are looking for, must have the center in this line. 12 00:00:55,689 --> 00:01:00,429 okay if you put the center of the circumference outside the line this line 13 00:01:00,429 --> 00:01:05,969 it wouldn't touch the circumference only in this point if it touch it it will be 14 00:01:05,969 --> 00:01:09,890 in another point too okay so it must be the center of the 15 00:01:09,890 --> 00:01:14,689 circumference of the solution must be in this line so we can choose the line we 16 00:01:14,689 --> 00:01:21,310 want okay so the point there whatever we want if we do it close to them to the 17 00:01:21,310 --> 00:01:33,459 point we will have a small circumference okay for example like this okay we put 18 00:01:33,459 --> 00:01:39,799 the needle of the compass in this point and the pencil in the point in the 19 00:01:39,799 --> 00:01:49,000 given the specific point okay and we draw a circumference of sorry that touch 20 00:01:49,000 --> 00:01:57,780 that touch the given one only in this point there again but we can we can 21 00:01:57,780 --> 00:02:02,459 choose another point and different point for example here okay and we will have a 22 00:02:02,459 --> 00:02:16,020 big circumference those two circumference that I have draw are also 23 00:02:16,020 --> 00:02:24,460 tangent in this point okay so the beautiful things the beautiful the 24 00:02:24,460 --> 00:02:30,719 beauty of tangents is that we can link one curve with another okay so you need 25 00:02:30,719 --> 00:02:42,120 to do that okay but for example if I make Center okay in in the in the 26 00:02:42,120 --> 00:02:54,560 circumference given till the point okay like this okay only till there okay and 27 00:02:54,560 --> 00:03:10,580 And then I do the circumference with the center in the other point from the given point, from the, okay, I make this, I make this arch, okay, that are fluent, yeah, okay? 28 00:03:10,659 --> 00:03:12,719 So this is the beauty of tangents.