ත්‍රිකෝණමිතිය|thrikeonamithiya grade 11|trigonometry sinhala |2025 O/l Exam |MathsDalaAththu|Sinhala

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Trigonometry lesson for the O/L Exam Maths DalaAththu Disapamok from a teacher,
All of you who have come to learn are warmly welcomed.

Trigonometry is the branch of mathematics that studies the relationships between the angles and side lengths of triangles, particularly right triangles. Its fundamental principles use trigonometric functions—such as sin, cos, and tan—to relate an angle to the ratios of its sides (opposite, adjacent, and hypotenuse). These functions are used to solve for unknown angles or side lengths in triangles, and trigonometry has wide applications in fields like engineering, science, and architecture. 
You can watch this video to learn the basic trigonometri sin inverse value and tan inverse value :

📌 Timestamps (Chapters):

00:00 = Welcome to our trigonometry grade 11 lesson sinhala
00:23 = trigonometry lesson Start
02:12 = How to find trigonometry sin inverse value
07:03 = How to find rigonometry tan inverse value
27:52 = All the Best..! Maths DalaAththu Students,, 🩷

Websites that can help you learn Maths
=================================

Ministry Of Education - Sri Lanka :-https://moe.gov.lk/
For the latest educational information

e-thaksalawa - Sri Lanka :- https://www.e-thaksalawa.moe.gov.lk/
For grade 1 to 13 curriculams such as creative lessons, all learning resources including past papers, term papers, questions, syllabuses, text books, teacher instruction manuals.

Department Of Examination - Sri Lanka :-https://www.doenets.lk/
For downloading past exam questions and answers, marking scheme

Education publications Department - Sri Lanka :- http://www.edupub.gov.lk/
For downloading all educational publications including textbooks

National Institute Of Education(NIE) - Sri Lanka :- https://www.nie.ac.lk/
For downloading syllabus, teacher handbooks, teacher guidebooks


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