Question

What is the length of line segment QR?

Answer 1

9.12 cm
10.36 cm
11.34 cm
12.61 cm

Answer 2

Let's just go with the law of sines for this one. Do you know how to apply the law of sines?

Answer 3

Nope, I didn't understand any of it

Answer 4

Law of sines basically says that the sin of an angle divided by the length of its opposite will be equal to any other sin of an angle over its opposite side. In this equation we would get the equation:\[\frac{ 2 }{ \sin10 }=\frac{ x }{ \sin80 }\]

Answer 5

Now we just have to get x alone.

Answer 6

What is sin

Answer 7

You're just gonna want to plug it into a calculator.

Answer 8

So just find a good online calculator (I use http://web2.0calc.com/) and then plug in\[\frac{ 2 }{ \sin10 }*\sin80\]

Answer 9

I got 11.34

Answer 10

That's the answer. And btw, what grade are you in?

Answer 11

8th

Answer 12

I'm great at algebra but this geometry class I take is really confusing, especially since I do online school I don't get much help

Answer 13

Really? Cause that was an 11th grade way of solving it. You shouldn't be doing the law of sines until trig.

Answer 14

Well I am taking a high school course, there are 11th graders in my class

Answer 15

We just started Trig

Answer 16

Are you skipping graedes? Cause you should know about sin by now. Have you learned sohcahtoa?

Answer 17

I don't think I am skipping any grades, and no, I don't know what that is.

Answer 18

You should have learned sohcahtoa back in algebra or geometry. And your class should not be doing law of sines problems if you don't have any idea what sin is.

Answer 19

We just started Trig today so the lesson was on Tangents

Answer 20

Well if you want to get a good lesson on sin, cos, tan, and the others just check out khanacademy. And ask me whenever you need, I'll help as much as I can :)

Answer 21

Okay, Thankyou ^^; You've been a big help.

Answer 22

haha no problem :) I'm taking trig this year so I know a fair amount about it.