1. First, fold the rectangular paper in half on the long side;
2. Fold the left and right parts in half, and then restore them, leaving a crease;
3. Then fold the upper left corner 45 to the center line;
4. As shown in the figure, rotate the lower left corner upward by 45;
5. Then fold the two trapeziums in the lower half upwards;
6. Fold the left and right parts in half as shown by the arrow.
Yes;
7. all right
How to paste a picture with DIY geometric collage method is a picture made up of materials with different textures and colors. Set painting and production in one, can give full play to children's practical ability. The making method of the pasted picture is as follows: the first step is to design a sketch. Design ideas on paper, determine the composition, character movements, background colors and other forms of the work. When designing sketches, we must consider the materials used in the works. There are many materials for pasting, such as colored paper, printed cloth, old calendars, etc. First determine the material, and then use the characteristics of the material to consider the picture. Generally speaking, beautiful and exquisite materials are the main part of the work. When designing, we should also pay attention to the operating characteristics of pasting pictures. In order to facilitate the cutting of scissors, we should make bold choices on images. The second step is to finalize the draft. Draw the designed sketch on a piece of white paper according to the same proportion of the size of the work, and then cut off the parts that need to be pasted with scissors. Be careful not to destroy the integrity of the manuscript. The third step is to draw materials. Find the material to paste, copy the cut graphics onto the material, and then tear the material into various shapes. The fourth step is to make the background color. First color the background of the work or choose a colored background (choose a thicker paper as the painting background). If the color design of the backing is complicated, it is necessary to draw a draft on the backing according to the finalized design and then color it. Step five, paste. First, mark the position of graphic paste on the backing paper (which can be done by cutting the final version), and then put the torn and cut material on the screen to see the actual effect. After adjustment and modification, carefully glue the material to the backing paper. When pasting, it should be carried out according to the principle of foreground first, close-up later, large area first and small area later. Finally, check whether there is anything to add, change the border, write the words well and post a picture.
Does the folding of geometric figures teach children to learn geometry
Not too simple, but also geometric figures. No matter what you do, as long as you fold it a few times more, it will not be simple, so the graphics you write are geometric.
You said I gave you the answer, right?
Geometry ∫BD and CE are bisectors of ∠ABC and ∠ACB, respectively.
∴∠DBC =∠Abd = 1/2∠ABC∠ECB =∠ace = 1/2∠ACB
∠∠DBC =∠ European Central Bank =3 1
∴ 1/2∠ABC = 1/2∠ACB
∴ ∠ABC=∠ACB=62
How to make geometric figures, rulers, compasses and drawings
Geometry 1. Let AE⊥BC be at point E, then BE=CE.
∵BD⊥AC
Yi Zheng △ CAE △ CBD
∴CD*CA=CE*CB
∴ 1/2CB*CB =CD*CA
∴BC^2=2CD*CA
2. Point D is DE‖AC, and the extension line of BC is at point E..
A quadrilateral is a parallelogram.
∴CE=AD,DE=AC
∵BD⊥AC
∴BD ⊥DE
BD = 8，AC =6
∴BE = 10
∴ The center line of trapezoid ABCD =1/2 (ad+BC) =1/2be =1/2 *10 = 5.
Step 3 connect ads
rule
AE^2=AD^2-DE^2
BE^2=BD^2-DE^2
∴AE^2-BE^2=AD^2-BD^2
D is the midpoint of BC
∴AD^2-BD^2=AD^2-CD^2=AC^2
∴AE ^2-BE^2=AC^2
Semicircular region +45-degree sector region-white * * * domain region
The white * * * domain can be divided into an isosceles right triangle and a quarter circle:
( 1/2)π* 1^2+( 1/8)π*2^2-( 1/2)* 1^2-( 1/4)π* 1^2=(3/4)π- 1/2