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#1 2014-09-17 02:32:32

cyerra
Guest

Sin,Cos, Tan, Sec, Csc, Cot.

2nu64go.png

Still looking at the image above, one angle is angle x, and another is the right angle (90o). Since the angles in a triangle add up to 180o, the other angle will be 90-x. For the unlabeled angle above, the angle 90-x:

7. What is the sin?
A 0.3
B 0.6 ♥
C 0.9
D 0.4
E 0.2
F 0.5


8. What is the cos?

A 0.8 ♥
B 0.2
C 0.6
D 0.4
E 0.1
F 0.9


9. What is the tan?
A 0.22
B 0.45
C 0.89
D 0.75
E 0.12
F 0.56


10. What is the sec?
A 1.32
B 3.69
C 2.45
D 1.25
E 1.82
F 1.47


11. What is the csc?
A 1.226
B 2.445
C 1.220
D 6.541
E 1.667
F 5.002


12. What is the cot?
A 1.009
B 2.341
C 5.211
D 1.333
E 5.294
F 3.025


13. If the cos of an angle is .75, what is the csc?

A 1/sqrt(5)
B 9/sqrt(6)
C 6/sqrt(2)
D 3/sqrt(9)
E 4/sqrt(7)
F 2/sqrt(3)


14. If the cot of an angle is 7/8, what is the tan?

A 8/7
B 6/5
C 4/10
D 3/9
E 4/3
F 7/8


I've tried to work on this for hours, but I couldn't get the answers correctly. In fact, I'm not even sure I'm answering them correctly starting from number 9. The hearts mark the answer I chose.

#2 2014-09-17 03:03:13

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Sin,Cos, Tan, Sec, Csc, Cot.

Hi;

7) is incorrect. Use SOHCAHTOA.

8) is incorrect use SOHCAHTOA.

9) Use SOHCAHTOA, in this case tan(x) = opposite / adjacent. Can you fill it in?

Before we go any further some things have to be put in your memory banks.

1) Pythagorean theorem.

2) SOHCAHTOA.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#3 2014-09-17 05:42:38

bob bundy
Administrator
Registered: 2010-06-20
Posts: 8,153

Re: Sin,Cos, Tan, Sec, Csc, Cot.

hi cyerra

Welcome to the forum.

Do I detect questions from Compuhigh ?

In Q7 I think they are asking for the sin(90-x), in which case B 0.6 looks good to me.

And Q8, cos(90-x) = 0.8 is right too.

For Q9, tan(90-x) you need the opposite to that angle and then divide that by the adjacent. 

(bobbym.  they cannot want tan(x) because none of the answers will give that.  I'm guessing that was in questions 1-6.  After all, we wouldn't want them to go to all the expense of making a fresh diagram.  smile

Q10  sec(90-x) = 1 over the cos of 90 -x so go back to Q8 and find 1/(that answer)

I suggest you post back answers for those two and then we can look at the rest.  smile

Bob


Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#4 2014-09-23 02:34:04

cyerra
Member
Registered: 2014-09-23
Posts: 4

Re: Sin,Cos, Tan, Sec, Csc, Cot.

Hi Bob. Thank you so much! Here are the answers I got for those two.

9. What is the tan?
A 0.22
B 0.45
C 0.89
D 0.75♥
E 0.12
F 0.56


10. What is the sec?
A 1.32
B 3.69
C 2.45
D 1.25♥
E 1.82
F 1.47

Hope I did it correctly. smile Sorry for the extremely late reply, I've been busy.

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#5 2014-09-23 02:39:48

cyerra
Member
Registered: 2014-09-23
Posts: 4

Re: Sin,Cos, Tan, Sec, Csc, Cot.

Oh and for 11 and 12 I got these answers.

11. What is the csc?
A 1.226
B 2.445
C 1.220
D 6.541
E 1.667♥
F 5.002


12. What is the cot?
A 1.009
B 2.341
C 5.211
D 1.333♥
E 5.294
F 3.025

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#6 2014-09-23 03:01:40

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

Re: Sin,Cos, Tan, Sec, Csc, Cot.

Hi cyerra

Welcome to the forum! smile

Yes, those answers all correct. Nice work!


“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#7 2014-09-23 03:16:26

cyerra
Member
Registered: 2014-09-23
Posts: 4

Re: Sin,Cos, Tan, Sec, Csc, Cot.

Could you help me with these two as well?

13. If the cos of an angle is .75, what is the csc?
A 1/sqrt(5)
B 9/sqrt(6)
C 6/sqrt(2)
D 3/sqrt(9)
E 4/sqrt(7)
F 2/sqrt(3)

14. If the cot of an angle is 7/8, what is the tan?
A 8/7
B 6/5
C 4/10
D 3/9
E 4/3
F 7/8

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#8 2014-09-23 03:29:21

cyerra
Member
Registered: 2014-09-23
Posts: 4

Re: Sin,Cos, Tan, Sec, Csc, Cot.

Nevermind, haha. Figured it out.

13. If the cos of an angle is .75, what is the csc?

A 1/sqrt(5)
B 9/sqrt(6)
C 6/sqrt(2)
D 3/sqrt(9)
E 4/sqrt(7) ♥
F 2/sqrt(3)


14. If the cot of an angle is 7/8, what is the tan?

A 8/7♥
B 6/5
C 4/10
D 3/9
E 4/3
F 7/8

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#9 2014-09-23 03:50:21

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

Re: Sin,Cos, Tan, Sec, Csc, Cot.

Yes, those are correct as well!


“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#10 2017-10-27 20:59:29

santner
Member
Registered: 2017-10-27
Posts: 2

Re: Sin,Cos, Tan, Sec, Csc, Cot.

Hey


I think you should remember what sin cos tan are .. SOHCAHTOA

You can also check value of sin, cos, tan for different angles like 0, 30, 60...

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