Class 10 · Mathematics · Mathematics

8. Introduction to Trigonometry

Try question 1

The value of sin 30° is

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Answer and explanation

Answer: A. 1/2

sin 30° = 1/2 is a standard value.

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Try question 2

The value of tan 45° is

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Answer and explanation

Answer: B. 1

In a right isosceles triangle the opposite and adjacent sides are equal, so tan 45° = 1.

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Try question 3

For any acute angle θ, sin²θ + cos²θ equals

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Answer and explanation

Answer: C. 1

This is the basic trigonometric identity.

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