Question

In the triangle below, determine the angle c

Answer 1

please help me

Answer 2

Do you what sin, cos, and tan are?

Answer 3

\[\cos(C) = \frac{adjacent side}{hypotenuse}\]

Answer 4

thats all the info it gave me

Answer 5

But, we need the angle C by itself. We use inverse cos! Instead of plugging in any angle, we plug in the side ratio.

\[\cos^{-1}(\frac{7}{15}) = \angle C\]

Answer 6

so how would i put that into my calculator

Answer 7

Do you have a scientific or graphing calculator?

Answer 8

both, its set on sci

Answer 9

Ok, the inverse cosine function should be 2ND KEY -> COS

Answer 10

i got an invalid unput tho

Answer 11

What do you mean?

Answer 12

Make sure you're putting in 7/15. Because 15/7 is greater than one, the cosine values don't go over 1.

Answer 13

i typed in 5/17*inverse cos and it said its an invalid input

Answer 14

You have to press the inverse cosine key first. We have to put the argument in it. It's like if you were trying to find the cos of an angle.

Answer 15

3.4000844141133395007001872142449 this?

Answer 16

That is incorrect, even in radians. Set your calculator to degrees.

Answer 17

it is

Answer 18

Just put in (7/15) into the argument, you don't have to do anything fancy.

Answer 19

what did u get?

Answer 20

I'm not giving the answer, what did YOU get, and I can verify. Make sure you're using inverse cosine.

Answer 21

3.4000844141133395007001872142449 i dont think im doing it right

Answer 22

You're not. :/ I don't know what to tell ya. Make sure it's 7/15 in the argument.

Answer 23

0.29411764705882352941176470588235?

Answer 24

...No, those aren't even answer choices. It's just
\[\cos^{-1}(\frac{7}{15})\]

Answer 25

It's not 1/cos. It's a separate function.

Answer 26

2.0587724148682444336640856376338

Answer 27

No. Just clear your calculator and do it again.

Answer 28

42

Answer 29

No. How are you getting 4 different answers? That means you're not inputting it correctly.

Answer 30

Take your calculator out of SCI mode. Put it in normal mode. I just put my calculator in SCI mode and it gave me the wrong answer.

Answer 31

Make sure you're in rectangular mode.

Answer 32

i keep getting 42

Answer 33

Break your calculator.

Answer 34

i just got 62.2 is that correct?

Answer 35

Yes...

Answer 36

thank you so much!