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 .

A Triangle ABC
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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

Using Pythagoras Theorem
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Then using Pythagoras theorem,
Question5:
If are acute angles such that , then show that .

A and B Are Acute Angles
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Answer:
In right triangle ABC,
But
[Angles opposite to equal sides are equal]