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)

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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 .

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Answer:

In , right angled at Q.

PR + QR = 25 cm and PQ = 5 cm

Let QR = and PR =

Using Pythagoras theorem,

RP² = RQ² + QP²

And