Question

@skullpatrol @mrnood

Answer 1

\[\large s = r \theta\]

Answer 2

What does that mean?

Answer 3

Multiply the radius by 0?

Answer 4

theta is not 0. Theta is the angle.

s = radius times angle

Answer 5

So, 2pi/3 * 5?

Answer 6

I got 10.5

Answer 7

But wouldn't I divide that by 2?

Answer 8

Why would you divide it by 2?

Answer 9

Ohh never mind, I was thinking of if I was trying to find the radius, my bad, could you help me with another question?

Answer 10

Okay.

Answer 11

To convert degrees to radians, multiply by \[\large \frac{ \pi }{ 180 }\]

Answer 12

So, multiply -280 by that formula?

Answer 13

I got -4.88

Answer 14

Keep it exact by not using a calculator.

Answer 15

Its option B! Because when I put them into the calculator I got what option B is. Or am I wrong?

Answer 16

Oh wait, it could be B or D because they are both the same when put into the calculator..

Answer 17

You'll need to know how to keep them exact at some point, so do it that way now. You can use a calculator to plug in the numbers, just not pi. Either way you need the exact fraction.

Answer 18

Without pi in the fraction?

Answer 19

Yes

Answer 20

Okay, so when I put into the calculator I got different numbers, but with both options they are the same still.

Answer 21

Show me your work

Answer 22

You really don't need a calculator at all for this, just simplify the fraction

Answer 23

What do you mean?

Answer 24

simplify it without a calculator.\[\large -280*\frac{ \pi }{180}\]

Answer 25

Ohh, okay,.

So, -280/1 * pi/180

-280/20 = 14 and 180/20 = 9 -> 14/9 is the new fraction

Answer 26

Sorry -14/9

Answer 27

Much better.

Answer 28

Okay, so what does that tell me? It still doesn't show which is the correct answer, I know its either B or D because of the fraction, but which number has pi with it?

Answer 29

It should be easy to tell... you started with this \[\large -280*\frac{ \pi }{180}\]

Answer 30

Pi should be on the top! Which means -14pi/9!

Answer 31

The pi hasn't moved or gone anywhere. Yes.

Answer 32

Thank you!(:

Answer 33

Welcome.

Answer 34

I understand this a lot more now.

Answer 35

Good.