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  • #: 165887
  • Price: $1.99 In Apple Store
  • Category: Education
  • Updated: 2016-11-10
  • Current Version: 1.3
  • 1.3
  • Size: 1.60 MB
  • Language: English
  • Seller: Dragan Savic
  • Requirements: Compatible with iPad. Requires iOS 3.2 or later
  • © 2010 S. Čičak
  •  Add to Favorite apps



*The best learning aid for trigonometry!*

*Big fat update*

- improved graphic design

- new features: animation, easier touch

gestures to handle the moving of the

rotating axis (see also "How to use

Trigonir"), degree and radian buttons

to move to specific point, e-mail unit

circle, and access to Trigonir's

Facebook page

- smaller bug fixes

The learning aid TRIGONIR© is patented (© S. Čičak).

Trigonir© is a product of a long lasting career in education. Teachers of mathematics have long been searching for a way to present trigonometric functions to students in an easy to understand yet professional manner, since the expression sine alone tends to evoke a feeling of discomfort among quite a few students.

This learning aid is the result of this consideration and has already been tested in various schools in Europe. Trigonir© brings forth a new, creative and interesting approach to analyzing and using trigonometric functions, which renders them understandable to all students, including those, who are not very fond of mathematics.

Trigonir© is comprised of two planes that are connected and movable. The bottom plane has the unit circle, angles from 0° to 360°, the tangent and cotangent axis as well as the values of trigonometric functions for basic angles inscribed on it. Red color is used to emphasize the negative values of trigonometric functions.

The upper plane has only one axle inscribed on it and can be moved circularly in order to determine various attributes of trigonometric functions for various angles.

Trigonir© enables us to determine the following properties of trigonometric functions:

- domain and co domain of functions,

- zeros of functions,

- points where a function is not defined ,

- increasing and decreasing of the


- positive/negative values,

- periodicity,

- evenness and oddness of a function,

- accurate value of basic angles, and

- properties of inverse functions (arcsin

α, arccos α , arctan α , arccot α).

The objectives of the learning aid Trigonir© are:

- less time spent on handling

trigonometric functions,

- a more interesting presentation of the


- a more active involvement of students

during lessons, and

- making studying easier and more


What's New in Version 1.3

- ready for iOS 10

iPad Screenshots

Trigonir iPad Screenshot 1

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The information may be outdated (2017-03-08 10:02:41). For actual information go to iTunes

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Trigonir for iPhone

featured by Apple as New and Noteworthy in Education category Learn trigonometry with ease in a graphical and interactive way.Simple usage instructions:use one fingers to rotate the axis.Trigonir is a product of a long lasting career in education. Teachers of mathematics have long been… more

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