I really can t do this problem, I can t do it for the sofa

bf=ce

bc=ef and ab de

ac∥df∠dfe=∠acb

abe=∠def

So abc def

ac=df This is a junior high school question, and it is very easy to learn. If it weren't for me, it would be really intolerable, you must know that these mathematical symbols can kill me.

Because ab parallel de

So angle b is equal to angle e

Because AC parallel DF

So the angle ACB is equal to the angle EFD

So the triangle ABC is similar to the triangle def

Because BF is equal to CE

So BC is equal to EF

So the triangle ABC is all equal to the triangle def

So AC is equal to DF

AC is parallel to FD so the angle ACB=DFE is the same as ABC=def because BF=DE so BF+FC=CE+FC, i.e., BC=EF is congruent.

Proof: Because bf=CE, bf+fc=ce+fc, i.e., bc=fe;

Because ab is parallel to de, the inner misalignment angle is equal, i.e., angle abc = angle fed;

And because AC is parallel to DF, the internal error angle is equal, that is: angle ACB = angle EFD;

From the ASA theorem of congruent triangles (i.e., the two angles of two triangles are equal and the sides sandwiched by the two corners are equal, and the two triangles are congruent), we get:

The triangle abc is all equal to the triangle def

So ac=df

Lose face! Write down the conditions given by the question! Proof, etc.! This means that xx is equal to xx

I think this problem is enough to connect af and cd wires to prove that acdf is a parallelogram.

In the sofa cover production skills, we must pay attention to the place where the backrest and the back are connected, but also use velvet hooks, as long as the backrest is the right size, it will not rotate.

1. With the most stupid method, it is made by parts, the backrest, the cushion, and the back are all separate, which is convenient for disassembly of the set and easy to clean.

2. Wrap the thread and rope inside, sew it with a sewing machine first, and clamp it between the front and side of the two pieces of cloth, and the beautiful teeth will come out.

3. What kind of velvet hook and loop is used for the connection of the sofa cover, which is the connection between the side and the seat part.

Velcro tape is attached to the back at the corners to hold it in place.

Sew a rope underneath and tie the couch legs or up and down.

The button is sewn on both sides to play a fixed role.

Measure the right size to prevent slippage.

The bottom is seamed with a wide tight band, which can play a fixed role in closing.

You can try all of the above.

Of course, it is best to choose rough fabrics, fabrics with a concave and convex feeling, and also have the effect of increasing friction and preventing sliding.

Light size is not possible.

There are shops that specialize in making sofa covers, first pick the fabric, and then take the sofa cover to the store, and you need to leave the sofa cover in the store (according to the size of your sofa cover).

Some curtain shops do do it, and the big ones can guarantee the craftsmanship but they usually find it too troublesome to do it. The small shop will accept this kind of order, but the process is difficult to guarantee, or Jianyi will go to a store specializing in sofa covers.

The local fabric store department has such a business.

1. Contact the local fabric store department, there should be such stores in general cities.

2. The fabric store should have a business staff to provide door-to-door size measurement business, and the salesman measures the size of the sofa, and then chooses the style, fabric and color according to the user's needs.

Where sofas are sold, sewing shops can be customized, and sofa covers are best not to buy online, and it is better to order them in physical stores.

Jingxin Garment City can be done on the first floor and flat sofa food store.

The sofa of the American theme furniture brand is of very good quality, my brother's family bought this brand, and bought it in the West Fourth Ring Red Star Macalline, especially the leather is very good, and the feel of imported leather is particularly good. But it's still necessary to compare more, take a look at more, heh Bijujube.

I also deliberately asked a friend to learn about this beautiful furniture brand before I let my brother buy, I heard a friend said that this brand of the factory has been exported to Europe, America, Southeast Asia and domestic OEM factories, many big brands of sofas are also this factory OEM, such as Stilolan, Lixing, Miluo, Kuma, now the factory has made this brand.

However, I advise everyone to go to the brand to test the rate, but it's nothing, depending on the personal like, it is not ashamed to be able to export to Europe and the United States and to so many brands OEM buried in the factory production, if the rational consumption pays attention to the quality, then it is OK. Hehe, my brother is this type, he doesn't have any money to buy a house, and big brands are advertising expenses.

See for yourself, hehe.

I bought it from Frandiss*** on Tmall, it is very practical and cost-effective, I recommend it to you.

Never been pitted because I use the Frandiss brand.

Is it to make 3D models? Size, height 70cm, width 35cm, length 2200cm, with a cut foot cuboid, if you want to do exquisite, you need to go on, design the bar gallery, ** to learn, there are many ways to make!

Size: , Model: Can be reclined.

Non-woven fabric, Velcro, raised cloth, zipper, fabric (linen, velvet ==), sofa hardware (special sofa shape, easy to search), sponge (hard cotton, upright cotton==), filling (doll cotton, pp cotton, pearl cotton==), wood (white pine, pine, larch, red pine==), blockboard, plywood ==

Wood, sponge, cloth, woodworking tools, a lot of things, some low-end sofas also need springs, the fabric is to be processed by sewing machines, must be made by professionals.