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Pi/9 Radians in Degrees

Welcome to pi/9 radians in degrees, our post explaining the angle conversion from radian to degrees measure commonly used in trigonometric functions.

The arc length of (1/9)×pi in a circle, that is the angle in radians, is usually abbreviated as pi/9 rad, and degrees are commonly written with the degree symbol °.

Skip intro and head directly to the result.

So, if you have been looking for pi/9 rad in deg or pi/9 rad to °, then you are right here, too, because these are two common short forms for the unit transformation under consideration.

In this article you can find everything about it, including the formula and a calculator you don’t want to miss.

Our app can change both, radians to degree measure as well as degrees to radians, and our tool even accepts “pi”, “pi”, “Pi” and “PI” as input. Give it a go, now!

Result and Calculator

You may change the argument in the first field, pi/9, our converter then does the calculation automatically, without the need to push the blue button.

Fill in the lower field if you like to invert the conversion and calculate degrees to radian measure.

In the next section of this post we discuss the math.

Convert pi/9 Radians to Degrees

Divide the angle in rad by pi, then multiply the term by 180° using the formula deg = ([pi/9] / pi) × 180°. Thus, you get (rounded to ten decimal places):

pi/9 rad = 20°

If you need the outcome with higher accuracy, then make use of our calculator above, or employ a calculator of your own and our formula.

Here’s all about negative pi/9 radians in degrees , including the formula and a converter.

Below we continue with more information about the conversion.

pi/9 Rad in Deg

Make sure to check out the additional information regarding the result notation of radians into degrees right below the image.

Note that (the result) 20 degrees, 20 degrees of arc, 20 arc degrees, as well as 20 arcdegrees are full spelling variants for 20° (degree measure).

Similar radian to degrees conversions in this category include, for example:
If you want to know more about the units of angle mentioned in this post, then read the articles located in the header menu of this website.

Bookmark us now, and then make sure to check out our search form in the menu and sidebar: it’s a very efficient way to locate frequently searched angle equivalents.

Ahead are the FAQs in the context.

Frequently Asked Questions

What is pi/9 radians in terms of pi?

An angle of pi/9 radians cuts off an arc of length pi/9r when placed at the center of a circle with the radius r; the relationship with pi can only be determined if the angle in degrees is known: pi/9 rad = degrees / 180° x pi.

Where is pi/9 radians on unit circle?

The angle of pi/9 radians lies in the first quadrant, between 0 and pi/2.

What is the angle measure of pi/9 radians?

pi/9 exact radians is equal to pi/9 / pi × 180° = 20°.

How many degrees in pi/9 radians?

pi/9 rad = pi/9 / pi × 180° = 20 degrees.

What’s bigger pi/9radian or pi/9 degree?

A circle has a little more than six radians, yet 360 degrees. Thus, pi/9 radians much bigger than pi/9 degrees.

What is pi/9 radians converted to degrees?

pi/9 radians converted to degrees equals 20 degrees.

How to convert pi/9 radians to degrees?

To convert pi/9 radians to degrees divide the angle in radians by pi, then multiply the term by 180°: degrees = pi/9/ pi × 180°.

What quadrant is pi/9 radians?

Because each quadrant has pi/2 radians we divide pi/9 by pi/2 = 0.222222222222222, then round this term modulo 4 up to nearest whole number between 1 and 4: 1. Thus, pi/9 rad lies in the first quadrant.

To see the answers click on the collapsible items.

Next is our chart with angles close to pi/9 rad and their equivalent in °.


This chart contains angles around pi/9 rad.
2pi/45 = 0.1396263402 rad
1pi/20 = 0.1570796327 rad
1pi/18 = 0.1745329252 rad10°
11pi/180 = 0.1919862177 rad11°
1pi/15 = 0.2094395102 rad12°
13pi/180 = 0.2268928028 rad13°
7pi/90 = 0.2443460953 rad14°
1pi/12 = 0.2617993878 rad15°
4pi/45 = 0.2792526803 rad16°
17pi/180 = 0.2967059728 rad17°
1pi/10 = 0.3141592654 rad18°
19pi/180 = 0.3316125579 rad19°
1pi/9 = 0.3490658504 rad20°
7pi/60 = 0.3665191429 rad21°
11pi/90 = 0.3839724354 rad22°
23pi/180 = 0.401425728 rad23°
2pi/15 = 0.4188790205 rad24°
5pi/36 = 0.436332313 rad25°
13pi/90 = 0.4537856055 rad26°
3pi/20 = 0.471238898 rad27°
7pi/45 = 0.4886921906 rad28°
29pi/180 = 0.5061454831 rad29°
1pi/6 = 0.5235987756 rad30°
31pi/180 = 0.5410520681 rad31°
8pi/45 = 0.5585053606 rad32°xx
In the final part of this article you can find the summary about how to convert pi/9 rad to degrees as well as some additional information.


You have reached the concluding section of our information about (1/9)×pi rad to deg.

pi/9 rad = 20°.

The radian measure is the standard unit of measure in the areas of math involving a circle like the sine and cosine function, just to name two trigonometric functions.

Using our calculator, formula and information, you have everything for changing the angle measurement at your disposal.

If you have found our post searching for pi/9 radian to degrees or a similar term, then you have gotten your answer as well: pi/9 rad ⇔ 20°.

Additional information

The positive movement of an angle in a circle is a counterclockwise revolution, and the angular measure is indicated in either of these units: rad, deg or grad (gradians).

The magnitude in radians tells you how far you have traveled on the arc. Try to remember that whenever you deal with radians or the other circular measure.

More information about the term radian, the entire circle, the diameter as well as the complete revolution can be found in radians to degrees.

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– Article written by Mark, last updated on April 13th, 2021