# 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 .

**Answer**

Given: A triangle ABC in which

Let

Then, Using Pythagoras theorem,

**Question4:**

Given , find .

**Answer:**

Given: A triangle ABC in which

Let

Then using Pythagoras theorem,

**Question5:**

If are acute angles such that , then show that .

**Answer:**

In right triangle ABC,

But

[Angles opposite to equal sides are equal]