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

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**Question 4:**

In right angles at B, if , find value of

(i)

(ii)

**Answer:**

Consider a triangle ABC in which

Let

Then, using Pythagoras theorem,

For , Base , Perpendicular and Hypotenuse

(i)

(ii)

**Question 5:**

In , right angled at , and . Determine the values of .

**Answer:**

In , right angled at Q.

PR + QR = 25 cm and PQ = 5 cm

Let QR = and PR =

Using Pythagoras theorem,

RP^{2} = RQ^{2} + QP^{2}

And