How to draw a nine cut circle in a triangle with CAD one large circle, three medium circles, six sm

Using the constraints in CAD, my approach is to draw a ** shape first, and the size of the circle can be ignored. , use tangent (each circle, 60 degree line, etc.), equal (two small circles), and use vertical, coincident horizontal, and angular constraints under the label. See Figure 1

Be sure to constrain the vertical and horizontal lines, and constrain 2 angles of 60 degrees.

After drawing this group, you can use AR to make its array, 3 parts of the ring array. It's not going to be done. Draw a 100-long horizontal line.

Then use the alignment under the modification, select the whole shape, let it align the line and scale it, of course, this step can also be scaled with sc, reference. to change the side of the triangle to 100. , draw it as shown in Figure 2

If you are interested in trying it, you can draw it.

CAD 2010 and later versions only began to have the function of "parametric constraints". Therefore, to use the above method, you must use version 2010 or later. Other methods, see if there are any. I don't know.

I had nothing to do, so I tried to draw it with proe, because the constraints of proe are very easy to useTake a regular triangle from the palette and set it to a side length of 100. Draw a few circles in it, tangent constraints, equal constraints, and it will be done in 2 minutes.

I checked the dimensions of both and there were no problems.

It's just that if you use PROE to draw, you won't be able to learn this knowledge from CAD learning exercises. CAD is such a powerful software, and in this regard, there is also a three-dimensional drawing, which is really inferior in comparison.

It's a bit of a mystery. When the size of the triangle is determined, the radius of these circles should be fixed.

1. Make a unit circle, and the center of the circle is o;

2. Take a diameter ab of the unit circle and destroy the difference between ab and ab by nine equal parts;

3. Take A and B as the center of the circle, and AB as the radius to make an arc, and intersect at the point C;

4. Connect c with the second bisect point on the diameter, and extend its intersection on the circle at the point d;

5. Connect AD and start from A, cut it in turn, and connect each point, and the figure made is a regular ninetagon.

Draw a triangle with a radius of 75, and then copy the element at the intersection of the element and the side of the triangle, repeat, and you can get a triangle with an edge length of 75, and each side has a yuan

Draw 6 circles of equal diameter tangent, then draw an inscribed triangle, and then scale them with the reference function of proportional scaling.

First draw 6 gardens tangent, then mark the side length of the inscribed triangle, and finally calculate the ratio to 75! Scale ......Bless you!

This is not simple, the radius of the small circle is generally the size of the large circle. The easiest way to draw is to draw a large circle first, and then draw a small circle with half a radius cut inside the great circle and only half of it, (there are so many ways to make them tangent, you can make the big circle half down and align it with the upper and lower left and right quadrant points; You can use two points as a circle to point a large circle, a circle, and a quadrant point to ......Then use a ring array, and arrange four around the center of the big circle.

1. Draw a large circle with a radius r

2. Calculate r=( 2-1)r

3. Make a small circle radius r through the diagonal

4. Draw a small circle, radius r, cut into a large circle.

5. Ring the center of the large circle with four small circles.

First draw a cross vertical line in the big circle, then remove half of each, and then draw 2 small circles with half of the center as the circle, and make a mirror image.

How are the four small circles lined up?

1. Make a unit circle, and the center of the circle is o;

2. Take a diameter ab of the unit circle and divide ab into nine equal parts;

3. Take A and B as the center of the circle and AB as the radius, and make an arc at the point C;

4. Connect c with the second bisect point on the diameter, and extend its intersection on the circle at the point d;

5. Connect AD and start from A, cut it in turn, and connect each point of the sparrow, and make a sharp figure that is a regular ninetagon.

The regular nine-shaped celery edge shape, starting from the radius of the cavity back to a Wu rent, the center of the circle corresponds to twenty degrees is the degree corresponding to one side.

To draw a graph as described in the title, you need to use proportional scaling, the idea is to first draw 10 tangent circles of equal radius, then make up the upper equilateral triangle, and then modify the side length of the equilateral triangle to the specified value through proportional scaling. The details are as follows:

The finished result is shown in the figure below.

inside the triangle.

There is only one inscribed circle.

You can draw it by tangent to the three sides...

Operate with constraints (tangent constraints).

Idea: The main thing is to determine the center and radius of the inscribed circle!

1. After the inscribed circle of any triangle is drawn, the distance between the center of the inscribed circle and the three sides of the triangle is equal, so the center of the circle is on the bisector of the triangle.

Use the drawing drop-down menu to the circle for the "Tangent Tangent" command.