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Introduction to Trigonometry
Mathematics · CBSE Class 10 · English Medium · 20 questions and answers
Sample questions
- Q: In a right triangle, define \sin\theta.
- A: \sin\theta=\dfrac{\text{opposite side}}{\text{hypotenuse}}.
- Q: Define \cos\theta in a right triangle.
- A: \cos\theta=\dfrac{\text{adjacent side}}{\text{hypotenuse}}.
- Q: Define \tan\theta in a right triangle.
- A: \tan\theta=\dfrac{\text{opposite side}}{\text{adjacent side}}=\dfrac{\sin\theta}{\cos\theta}.
- Q: State the reciprocal ratios of \sin, \cos and \tan.
- A: \csc\theta=\frac{1}{\sin\theta}, \sec\theta=\frac{1}{\cos\theta}, \cot\theta=\frac{1}{\tan\theta}.
- Q: State the identity connecting \sin and \cos.
- A: \sin^2\theta+\cos^2\theta=1.
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