# RBSE Solutions for Class 9 Maths Chapter 14 Trigonometric Ratios of Acute Angles Ex 14.1

RBSE Solutions for Class 9 Maths Chapter 14 Trigonometric Ratios of Acute Angles Ex 14.1 is part of RBSE Solutions for Class 9 Maths. Here we have given Rajasthan Board RBSE Class 9 Maths Solutions Chapter 14 Trigonometric Ratios of Acute Angles Exercise 14.1.

 Board RBSE Textbook SIERT, Rajasthan Class Class 9 Subject Maths Chapter Chapter 14 Chapter Name Trigonometric Ratios of Acute Angles Exercise Ex 14.1 Number of Questions Solved 10 Category RBSE Solutions

## Rajasthan Board RBSE Class 9 Maths Solutions Chapter 14 Trigonometric Ratios of Acute Angles Ex 14.1

Question 1.
If in a triangle ABC, ∠A = 90°, a = 25 cm, b = 7 cm, then find all (RBSESolutions.com) the trigonometrical ratios of ∠B and ∠C.
Solution.
Here it is given that
∠A = 90°, BC = 25 cm and AC = 7 cm
AB2 + AC2 = BC2
⇒ AB2 = BC2 – AC2   Question 2.
If in ∆ABC, ∠B = 90°, a = 12 cm, b = 13 cm, then find (RBSESolutions.com) the trigonometrical ratios of ∠A and ∠C.
Solution.
Given that ∠B = 90°, AC = 13 cm, BC = 12 cm Question 3.
If tan A = √2 – 1 then prove that sin A cos A = $$\frac { 1 }{ 2\surd 2 }$$
Solution.
tan A = $$\frac { \surd 2-1 }{ 1 } =\frac { Perpendicular }{ Base }$$
Now construct (RBSESolutions.com) a triangle ABC in which
∠B = 90° and BC : AB = (√2 – 1) : 1
⇒ BC = (√2 – 1 )k, AB = k, where k is any constant  Question 4.
If sin A = $$\frac { 1 }{ 3 }$$ then find (RBSESolutions.com) the value of cos A . cosec A + tan A . sec A
Solution.
sin A = $$\frac { 1 }{ 3 }$$
Now we will construct a triangle ABC in which ∠B = 90° and BC : AC = 1 : 3
Let BC = k and AC = 3k where k > 0 which is a constant quantity. Question 5.
If cos θ = $$\frac { 8 }{ 17 }$$, then find (RBSESolutions.com) all the remaining trigonometrical ratios.
Solution.   Question 6.
If cos A = $$\frac { 5 }{ 13 }$$, then find the value (RBSESolutions.com) of $$\frac { cosec\quad A }{ cos\quad A+cosec\quad A }$$
Solution.  Question 7.
If 5 tan θ = 4, then find the (RBSESolutions.com) value of $$\frac { 5sin\theta -3cos\theta }{ sin\theta +2cos\theta }$$
Solution.  Question 8.
In a ∆ABC, ∠C = 90° and if cot A = √3 and cot B = $$\frac { 1 }{ \surd 3 }$$ then (RBSESolutions.com) prove that sin A cos B + cos A sin B = 1.
Solution.   Question 9.
If 16 cot A = 12, then find the (RBSESolutions.com) value of $$\frac { sinA+cosA }{ sinA-cosA }$$
Solution. Question 10.
In figure, AD = DB and ∠B = 90° then find the (RBSESolutions.com) value of the following:
(i) sin θ
(ii) cos θ
(iii) tan θ
Solution.
Given that AD = DB and ∠B = 90°   We hope the given RBSE Solutions for Class 9 Maths Chapter 14 Trigonometric Ratios of Acute Angles Ex 14.1 will help you. If you have any query regarding Rajasthan Board RBSE Class 9 Maths Solutions Chapter 14 Trigonometric Ratios of Acute Angles Exercise 14.1, drop a comment below and we will get back to you at the earliest.