Properties of Triangles · Mathematics · NDA

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MCQ (Single Correct Answer)

1
The sides of the tringle are in
NDA 2015 Paper 2
2
sin A, sin B, sin C are in
NDA 2015 Paper 2
3
In a triangle ABC, a $$-$$ 2b + c = 0. The value of $$\cot \left( {{A \over 2}} \right)\cot \left( {{C \over 2}} \right)$$ is
NDA 2017 Paper 2
4
Consider the following statements :

Statement I

If the line segment joining the points P(m, n) and Q(r, s) subtends an angle $$\alpha$$ at the origin, then $$\cos \alpha = {{ms - nr} \over {\sqrt {({m^2} + {n^2})({r^2} + {s^2})} }}$$.

Statement II

In any triangle ABC, it is true that $${a^2} = {b^2} + {c^2} - 2bc\cos A$$.

Which one of the following is correct in respect of the above two statements?
NDA 2018 Paper 2
5
What is the area of the triangle with vertices $$\left( {{x_1},{1 \over {{x_1}}}} \right),\left( {{x_2},{1 \over {{x_2}}}} \right),\left( {{x_3},{1 \over {{x_3}}}} \right)$$ ?
NDA 2018 Paper 2
6
In a $$\Delta$$ABC, if a = 2, b = 3 and $$\sin A = {2 \over 3}$$, then what is $$\angle$$B equal to?
NDA 2018 Paper 1
7
If the angles of a triangle ABC are in AP and b : c = $${\sqrt 3 }$$ : $${\sqrt 2 }$$, then what is the measure of angle A ?
NDA 2019 Paper 2
8
If the angles of a triangle ABC are in the ratio 1 : 2 : 3, then the corresponding sides are in the ratio
NDA 2019 Paper 1
9
In a triangle ABC $\rm \frac{a}{\cos A}=\frac{b}{\cos B}=\frac{c}{\cos C}$ What is the area of the triangle if a = 6 cm?
NDA Mathematics 1st September 2024
10

In a triangle ABC, ∠A = 75° and ∠B = 45°. What is 2a - b equal to?

NDA Mathematics 1st September 2024
11
In a triangle ABC tan A + tan B + tan C = k  What is the value of cot A cot B cot C? 
NDA Mathematics 1st September 2024
12

$ABC$ is a triangle such that angle $C = 60^{\circ}$, then what is $\frac{\cos A + \cos B}{\cos \left(\frac{A - B}{2}\right)}$ equal to?

NDA Mathematics 21 April 2024
13

In a triangle $ABC$, $AB=16 \text{ cm}, BC=63 \text{ cm}$ and $AC=65 \text{ cm}$. What is the value of $\cos 2A+\cos 2B+\cos 2C$?

NDA Mathematics 21 April 2024
14

Consider the following statements:

1. In a triangle $ABC$, if $\cot A \cdot \cot B \cdot \cot C>0$, then the triangle is an acute-angled triangle.

2. In a triangle $ABC$, if $\tan A \cdot \tan B \cdot \tan C > 0$, then the triangle is an obtuse-angled triangle.

Which of the statements given above is/are correct?

NDA Mathematics 21 April 2024
15
What is the value of a + b + √2 c equal to ?
NDA Mathematics 3 September 2023
16
What is the ratio of a2 ∶ b2 ∶ c2 ?
NDA Mathematics 3 September 2023
17
What is the perimeter of the triangle ?
NDA Mathematics 16 April 2023
18

Consider the following statements :

1. ABC is right angled triangle

2. The angles of the triangle are in AP

Which of the statements given above is/are correct ? 

NDA Mathematics 16 April 2023
19
What is the nature of the triangle ? 
NDA Mathematics 16 April 2023
20
If c = 8, what is the area of the triangle ?
NDA Mathematics 16 April 2023
21
What is the value of n ? 
NDA Mathematics 16 April 2023
22
What is the length of the smallest side ?
NDA Mathematics 16 April 2023
23

What is $\frac{\text{AB}}{\sin \text{C}}$ equal to ?

NDA Mathematics 4 September 2022
24

What is cos A + cos B + cos C equal to ?

NDA Mathematics 4 September 2022
25
In a triangle ABC, a = 4, b = 3, c = 2. What is cos 3C equal to ?
NDA Mathematics 4 September 2022
26
Let a, b, c be the lengths of sides BC, CA, AB respectively of a triangle ABC. If p is the perimeter and q is the area of the triangle, then what is $p(p-2a) \tan \left(\frac{A}{2}\right)$ equal to ?
NDA Mathematics 10 April 2022
27

Consider the following statements:

1. The third vertex has at least one irrational coordinate.

2. The area is irrational.

Which of the above statements is/are correct?

NDA Mathematics 14 November 2021
28
The sides of a triangle are m, n and $\rm \sqrt{m^2+n^2+mn}$. What is the sum of the acute angles of the triangle?
NDA Mathematics 18 April 2021
29
What is the area of the triangle ABC with sides a = 10cm  and c = 4cm angle B = 30°?
NDA Mathematics 18 April 2021
30
What is the interior angle of a regular octagon of side length 2 cm?
NDA Mathematics 18 April 2021
31
A 24 cm long wire is bent to form a triangle with one of the angles as 60°. What is the altitude of the triangle having the greatest possible area?
NDA Mathematics 18 April 2021
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