Question

A right triangles hypotenuse is 20m long. What is the length of the side opposite a 60degree angle? Give your answer to the nearest tenth of a cenimeter.

Answer 1

@Momo_ please help? im really lost :(

Answer 2

@Kwamgreen101 please help?

Answer 3

@kc_kennylau

Answer 4

Do you remember the definitions of sine, cosine and tangent?

Answer 5

no this whole question confuses me :/ just started at a new school and im lost :/

Answer 6

Remember these definitions; they'd be very useful

Answer 7

So can you apply the definition of sine to the triangle in question?

Answer 8

?/20 ??

Answer 9

Yes, but don't miss out the left hand side

Answer 10

What is ?/20 the value of?

Answer 11

b/c or a leg/hypotenuse. right?

Answer 12

Okay maybe I'm confusing, I meant sinθ=?/20

Answer 13

oh sorry :/

Answer 14

Nah it's my fault, continue?

Answer 15

yes please :)

Answer 16

Remember the value of θ?

Answer 17

no im sorry :(

Answer 18

Don't apologize it's not your fault; look at the first picture I gave you?

Answer 19

okay 60?

Answer 20

So you now have \(\sin60^\circ=\dfrac?{20}\)

Answer 21

Do you have the special values table?

Answer 22

http://1.bp.blogspot.com/-hMJbFxPODZA/US11g-ZZpgI/AAAAAAAACK0/rbGiNhWHuO8/s400/special_angles_1.gif

Answer 23

This is the table if you don't have

Answer 24

thank you. so what do I do now

Answer 25

Solve the equation :)

Answer 26

it says 60degrees = pie/3. how do I do this??

Answer 27

Look at the table to find the value of \(\sin60^\circ\) first?

Answer 28

Ignore the row with \(\pi\)s

Answer 29

squareroot3/2

Answer 30

Yep, plug it in \(\sin60^\circ=\dfrac?{20}\)

Answer 31

60deg=sqrt3/2/20

Answer 32

right?

Answer 33

Please treat \(\sin60^\circ\) as one identity

Answer 34

You just said \(\sin60^\circ=\dfrac{\sqrt3}2\)

Answer 35

okay so that's the equation? no 20?

Answer 36

No

Answer 37

\[\begin{array}{rcl}
\sin60^\circ&=&\frac?{20}\\
\frac{\sqrt3}2&=&\frac?{20}\\
\end{array}\]

Answer 38

Continue

Answer 39

I give up haha I'm just going to pick an answer cause this is making no sense whatsoever

Answer 40

thank you for helping though

Answer 41

okay...