Half annulus 1st and 2nd quadrant

  • MHB
  • Thread starter Dustinsfl
  • Start date
In summary, the conversation was about creating an annulus with arrows oriented counterclockwise, starting at delta and ending at R on the positive x-axis, then going to -R and circling back to -delta before completing the loop at delta again. The conversation also discussed the possibility of making the annulus wider and the use of \newcommand's in the code. The speaker also mentioned a preference for using Corel Draw for creating images and exporting them as EPS files.
  • #1
Dustinsfl
2,281
5
I am trying to make a annulus oriented counterclockwise so with arrows.

So the annulus goes from delta to R on the positive x-axis then circles around to -R and goes to -delta and circles around from -delta to delta.
 
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  • #2
Like this?

annulus.png


Code:
 \usetikzlibrary{arrows,decorations.markings}
 \begin{tikzpicture}[>=stealth']
 \newcommand\delt{1.5}
 \newcommand\R{2}
 \draw[->] (-3,0) -- (3,0);
 \draw[->] (0,-1) -- (0,3);
 \node[below] at (\R,0) {$R$};
 \node[below] at (\delt,0) {$\delta$};
 \draw[
   thick,
   decoration={
     markings,
     mark=at position 2cm with {\arrow{>}},
     mark=at position 8cm with {\arrow{>}}},
   postaction={decorate}]
   (\R,0) arc[start angle=0,end angle=180,radius=\R] --
   (-\delt,0) arc[start angle=180,end angle=0,radius=\delt] -- cycle;
 \end{tikzpicture}
 
  • #3
Evgeny.Makarov said:
Like this?

annulus.png


Code:
 \usetikzlibrary{arrows,decorations.markings}
 \begin{tikzpicture}[>=stealth']
 \newcommand\delt{1.5}
 \newcommand\R{2}
 \draw[->] (-3,0) -- (3,0);
 \draw[->] (0,-1) -- (0,3);
 \node[below] at (\R,0) {$R$};
 \node[below] at (\delt,0) {$\delta$};
 \draw[
   thick,
   decoration={
     markings,
     mark=at position 2cm with {\arrow{>}},
     mark=at position 8cm with {\arrow{>}}},
   postaction={decorate}]
   (\R,0) arc[start angle=0,end angle=180,radius=\R] --
   (-\delt,0) arc[start angle=180,end angle=0,radius=\delt] -- cycle;
 \end{tikzpicture}

What can I change to make the annulus wider?
 
  • #4
There are \newcommand's in the beginning that define delta and R.
 
  • #5
I find a lot of work of making pictures on LaTeX, I do rather prefer Corel Draw which can give you amazing results and you can export images on EPS.
 

FAQ: Half annulus 1st and 2nd quadrant

What is a half annulus in the 1st and 2nd quadrant?

A half annulus in the 1st and 2nd quadrant is a geometric shape that is formed by taking a half circle and extending it in the opposite direction to create a half-ring shape. This shape is commonly seen in mathematics and engineering applications.

How is the area of a half annulus in the 1st and 2nd quadrant calculated?

The area of a half annulus in the 1st and 2nd quadrant can be calculated by subtracting the area of the smaller circle from the area of the larger circle. The formula for the area of a circle is πr^2, so for a half annulus, the formula would be 1/2(πr^2 - πR^2), where r is the radius of the smaller circle and R is the radius of the larger circle.

What are the properties of a half annulus in the 1st and 2nd quadrant?

A half annulus in the 1st and 2nd quadrant has several key properties, including: it is a curved shape, it has two radii (one for the smaller circle and one for the larger circle), it has a curved perimeter, and it has a non-zero area.

How is a half annulus in the 1st and 2nd quadrant used in real-world applications?

A half annulus in the 1st and 2nd quadrant is commonly used in engineering and architecture for creating curved structures, such as arches and domes. It is also used in mathematics for calculating the area of curved shapes and for solving geometry problems involving circles and arcs.

What is the difference between a half annulus in the 1st and 2nd quadrant and a full annulus?

The main difference between a half annulus in the 1st and 2nd quadrant and a full annulus is that a half annulus has a curved perimeter on one side, while a full annulus has a curved perimeter on both sides. Additionally, the area of a full annulus is twice the area of a half annulus, as it includes both the inner and outer circle areas.

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