Aren't all solid geometry problems for you to prove or calculate?
If you really encounter a problem and read it only three times, you need to revert to the original geometry.
Then you can lay out the length, width and height (that is, long alignment, high horizontal alignment and equal width) characteristics of geometric figures on the draft paper.
Then, draw the orthographic drawing with the standard oblique bipartite drawing method.
It can be seen from the oblique survey that this link fully explains the method of oblique survey.
Simply put:
Please draw with HB~3H pencil (incorrect erasure will not pollute the paper or draft).
The height and length are unchanged, and the "width" angle of 45 degrees is inclined to the right, and the length becomes the original 1/2.
After painting, think about which lines are invisible, please wipe them with dotted lines.
Black the solid line with 2B or a black pen.
How to draw a mathematical solid geometric figure according to the topic? If you understand the requirements of the topic, draw it according to that meaning It is very important to remember perspective in solid geometry.
How to draw a good three-dimensional geometric map? Thank you for paying attention to the five colors of sketch, which can show the boundary between highlight, projection and light and dark.
So your photo looks three-dimensional,
The three-dimensional geometric map of college entrance examination mathematics can be seen, but the solid line can't be seen. Two sides intersect, two lines intersect, and the intersection point forms a line-line composition surface (key point in Figure 3). First find out why (high level, relatively long, equal width), why some draw solid lines and some draw dotted lines, and then find more objects to draw 3 checks.
How to draw solid geometry? Draw a horizontal bottom first. Methods Oblique drawing method was used, and the rules were as follows:
The length of horizontal line segment is unchanged, and the vertical line segment is shortened to half of the original;
After drawing the bottom surface, draw parallel lines with the same length upward through the vertex of the bottom surface instead of the side, and draw well.
After a line segment with equal length, connect all endpoints of the drawn line segment to automatically form a figure that is congruent with the bottom surface;
What software is the most accurate and authoritative for drawing high school three-dimensional geometric figures? Of course, it is the "geometric sketchpad", and now the more advanced one is the "super sketchpad". The software developed for mathematics can draw several graphs and various function images.
The teacher assigned homework and asked us to draw 80 solid geometric figures. How to draw them is just a requirement of the teacher.
Of course, it also includes my own understanding of solid geometry.
Points, lines and polygons are solid geometric figures. Don't be limited to triangular pyramids, quadrangular prisms and so on.
80 dots are printed on the exercise book (paper) continuously, that is, 80 solid geometric figures!
(Well, pronunciation: capitalized sounds are just a click on the paper with a pen).
If you can't achieve your goal with simple characters, you can't do it on Zhihu, because Zhihu doesn't support uploading pictures. You can post in other forums (including your pictures), and then add a link to that post in your Zhihu post. At present, this is the only way.
Mathematical symbols that cannot be drawn can be used as special symbols, such as ≦≠≤×
If you want to draw, you can draw on your own machine first, and then upload it to Baidu space. Just attach the above address when asking questions.
Can you draw plane and three-dimensional geometric figures with Word2003? WORD itself can draw some simple plane and three-dimensional graphics, and can also control the effects such as shadows and lighting, but it is different from professional graphics processing software;
Graphic software is famous and successful: Photoshop, CorelDRAW, Freehand, Illustrator, Firewall, etc.
Three-dimensional software is famous and successful:
Maya, Unigraphic, 3DS Max, Proengeneer, Softimage, Lightwave, rhino and so on.
How does java draw solid geometric figures? Java output diamond code;
system . out . print(" ")；
for(k = 1； k & lt= 2 * I- 1； k++)
system . out . print(" * ")；
system . out . println(" ")；
}
for(I = 1； I < = 4; i++) {
for(j = 1； j & lt= I； j++)
system . out . print(" ")；
for(k = 1； k & lt= 9-2 * I； k++)
system . out . print(" * ")；
system . out . println(" ")；
}
}
}
Drawing algorithm:
1, divided into two parts.
2. Change the blank part of the output to the output * part.
3. The last label needs packing.