Register

NIELIT 2019 Feb Scientist C - Section D: 13

• edited by
2,144 views

1 Answer

0 0 votes
Ans is option (A)

Using the cosine rule of triangle trigonometry ,

$cosC=\frac{a^{2}+b^{2}-c^{2}}{2ab}$

$\Rightarrow$   $cos120^{\circ}=\frac{64+144-c^{2}}{2\times8\times12}$

$\Rightarrow$  $c^{2}=304$   $\Rightarrow$  $c=4\sqrt{19}km$
Voting & Accepting an answer helps improve the community
← Previous · NIELIT 2019 Feb Scie...Next → · NIELIT 2019 Feb Scie...
← Previous in category · NIELIT 2019 Feb Scie...Next in category → · NIELIT 2019 Feb Scie...
Position:
Show:

Related questions

0 0 votes
2 answers 2 answers
3.2k
3.2k views
Lakshman Bhaiya asked Apr 1, 2020
3,192 views
NIELIT 2019 Feb Scientist C - Section D: 1
The minute hand is $10$ cm long. Find the area of the face of the clock described by the minute hand between $9$ a.m and $9:35$ a.m.${183.3\ cm^{2}}$${366.6\ cm^{2}}$${24...
0 0 votes
1 1 answer
1.9k
1.9k views
Lakshman Bhaiya asked Apr 1, 2020
1,904 views
NIELIT 2019 Feb Scientist C - Section D: 2
Determine $a+b$ such that the following system of equations:$2x-(a-4)y=2b+1 \text{ and }4x-(a-1)y=5b-1$ infinite solutions.$11$$9$$10$$8$
0 0 votes
2 2 answers
2.7k
2.7k views
Lakshman Bhaiya asked Apr 1, 2020
2,656 views
NIELIT 2019 Feb Scientist C - Section D: 3
The line $x+y=4$ divides the line joining $\text{(-1,1) & (5,7)}$ in the ratio $\lambda : 1$ then the value of $\lambda$ is:$2$$3$$\dfrac{1}{2}$$1$
0 0 votes
1 1 answer
1.9k
1.9k views
Lakshman Bhaiya asked Apr 1, 2020
1,890 views
NIELIT 2019 Feb Scientist C - Section D: 4
Which of the following statement is false?$\begin{array}{ll} \text{Statement(i)} : & \dfrac{501}{25} \text{ is a terminating decimal.} \\ \text{Statement(ii)} : & \dfrac{...
0 0 votes
1 answers 1 answer
2.1k
2.1k views
Lakshman Bhaiya asked Apr 1, 2020
2,056 views
NIELIT 2019 Feb Scientist C - Section D: 5
The value of $\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+ \dots \dots \dots+\dfrac{1}{90}$ is:$\dfrac{1}{5}\\$$\dfrac{2}{5} \\$$\dfrac{3}{5} \\$$1$