CBSE Class 10-Mathematics: Chapter –8 Introduction to Trigonometry Part 4

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Question 2:

In adjoining figure, find

Answer:

Using Pythagoras theorem,

Question3:

If , calculate and .

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Answer

Given: A triangle ABC in which

Let

Then, Using Pythagoras theorem,

Question4:

Given , find .

Answer:

Given: A triangle ABC in which

Let

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Then using Pythagoras theorem,

Question5:

If are acute angles such that , then show that .

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Answer:

In right triangle ABC,

But

[Angles opposite to equal sides are equal]