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.
- domain and co domain of functions,
- zeros of functions,
- points where a function is not defined ,
- increasing and decreasing of the
function,
- 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).
- less time spent on handling
trigonometric functions,
- a more interesting presentation of the
subject,
- a more active involvement of students
during lessons, and
- making studying easier and more
independent.