# NCERT Solutions for Class 11 Maths Chapter 3 Supplementary Exercise 3.5

NCERT Solutions for Class 11 Maths Chapter 3 Supplementary Exercise 3.5 of Trigonometric Functions in Hindi Medium for the students using NCERT Books in Hindi are given below for session 2020-21.

English Medium NCERT Solutions 2020-21 are also given for those who are using Textbooks in English Medium. NCERT Solutions and Offline Apps are in updated form based on latest CBSE Syllabus 2020-21 for all the boards (CBSE, UP Board, MP Board, Bihar, Gujrat and others) who are using NCERT Books 2020-2021.## NCERT Solutions for Class 11 Maths Chapter 3 Supplementary Exercise 3.5

Class: | 11 |

Subject: | Maths – गणित |

Chapter 3: | Supplementary Exercise 3.5 |

### Class 11 Maths Chapter 3 Supplementary Exercise 3.5 Sols

NCERT Solutions for Class 11 Maths Chapter 3 Exercise 3.5 Supplementary Exercise of Trigonometric Functions in English & Hindi Medium are given below updated for new academic session 2020-21. It is an important one as per examination point of view. After doing all the main exercises, students must do this as it is based on sine and cosine rule which is important for further classes. Visit to NCERT Solutions for Class 11 Maths Chapter 3 main page to see the solutions of other exercises. All the questions of this exercise are based on sine and cosine formulae.

### 11th Maths Chapter 3 Exercise 3.5

##### What is Cosine formula?

Cosine formula: The cosine of an angle A of any triangle ABC, whose sides are a (opposite to BC), b (opposite to AC) and c (opposite to AB) is given by cos A = [b² + c² – a²]/2bc.

##### साइन सूत्र तथा कोसाइन सूत्र से आप क्या समझते हैं?

साइन सूत्र: किसी भी त्रिभुज में, भुजाएँ सम्मुख कोणों के साइनों के समानुपाती होती हैं।

(sin A)/a = (sin B)/b = (sin C)/c = k

कोसाइन सूत्र: किसी त्रिभुज ABC, जिसके कोण A, B और C हैं तथा a, b और c क्रमशः कोणों की सम्मुख भुजाएँ हैं। cos A = [b² + c² – a²]/2bc

#### About 11 Maths Exercise 3.5 Supplementary

In Chapter 3 Exercise 3.5, mainly the sine formula and cosine formula are introduced. The questions are given on the basis of these formula only. Some of the problems required both the formulae simultaneously.

Sine Formula: In any triangle, the sides of triangle are proportional to the sine of angles opposite to the sides.

i.e. (sin A)/a = (sin B)/b = (sin C)/c = k, where k is a constant.

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