Mô hình Compa để vẽ Elip (Archimedes Trammel)

Hello Mr. Phuc and all of you in the Mathematics class 29, Mathematics Today I would like to introduce my model It is called Asymmetric Trammel It is a simple combination to draw an ellipse The purpose of this model is to introduce to the students in the 10th grade ellipse In addition to drawing an ellipse with a ruler We can have other devices to draw an ellipse It can also be used as a toy Or you can draw an ellipse by yourself That's about the model Now I will show you how to draw an ellipse You can use a pen or a pencil Put the pencil on the paper Hold the pencil for a while and start to rotate Try to hold it tight Rotate like this Follow those lines to draw an ellipse This model is quite simple So there may be some mistakes Please understand The way to make this model First, we need a base This base can be thick or hard I use A4 paper A4 paper is a bit thick You can use it to make a base for a book Cut a wooden stick like this These sticks are cut in half Glue the two sides together To make it easier, we can draw a line on the paper We can look closer Measure first This wooden stick is usually 1cm Measure first Then glue it I glue two layers One layer below It's enough space for a stick to move To make the toys move inside Can you see it? The second one is I glue one more layer To make the toys stay in place I hold it tight To make it enough space for a stick to move It's quite simple These sticks are actually These are the small parts of the stick You can find a small part I use 502 glue We can make some holes For this wood stick, it's easy to break So when you make it, you should glue it first To make the holes later So it won't break So this is a stick This is the remaining part when you cut a stick to get 2 toys The remaining part can be used to make a stand for the pen So the total number of sticks is very small This is 4, below 4 is 8 This toy is 9, this one is 10 All of them are 10 10 wooden sticks 1 beer bottle A pair of scissors Glue You can use this glue to glue Or double-sided glue, clear glue, it depends on you You can choose If you don't want to use double-sided glue, you can use clear glue