alleryTrigonometric ratios were originally ratios of sides of a triangle that is:
AEquilateral
BIsosceles
CObtuse angled
DRight angled
Answer & Solution
Correct answer: D. Right angled
1. The ratios compare two sides of a triangle.
2. The triangle must contain a right angle.
3. So they are ratios of sides of a right angled triangle.
_Source: syllabus Mathematics, Chapter 3, Trigonometric Functions._
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