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In earlier classes, trigonometric ratios were defined for angles that are:
AReflex
BZero
CAcute
DObtuse
Answer & Solution
Correct answer: C. Acute
1. The old definition used the sides of a right angled triangle.
2. Such a triangle only has angles below ninety degrees.
3. So the ratios were defined for acute angles.
_Source: NCERT Class 11 Mathematics, Chapter 3, Trigonometric Functions._
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