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Trigonometry was originally developed to solve geometric problems involving:
ATriangles
BTrapezia
CTangents
DTessera
Answer & Solution
Correct answer: A. Triangles
1. The subject began as practical geometry.
2. Its name already points at the figure concerned.
3. The subject was originally developed to solve geometric problems involving triangles.
4. So the answer is triangles.
_Source: NCERT Class XI Mathematics, Ch 3 'Trigonometric Functions'_
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