Lifelong Learning Programme

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TEACHERS EXPERIENCES FORM

Title of the Experience
Trigonometric functions as ratio of 2 sides in rectangular triangle
Name of the teacher
Marieta Andreeva
Country where it took place
Bulgaria
School typology
High Secondary School
Thematic Area
Maths
Experience typology
Teaching in class
Type of contact
Direct
Description of the Experience
The trigonometric functions as functions of angles and ratio of sides in a rectangular triangle are difficult to be remembered by the students. In order to remember these ratio more easily I drive them to make association with the first letter the term begins – sinus. The sinus of angle ‘α’ is ratio of opposite standing cathetus to hypotenuse. The word ‘sinus’ and the word ‘opposite’ (in Bulgarian) begin with one the same letter – ‘s’. So they easily remember which cathetus defines sinus and then by the method of exclusion the other cathetus – the adjacent, remains for defining of cosine of the angle.

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