Question

https://media.glynlyon.com/g_geo_2013/5/67_340.gif

sin K =



1/2

(√3)/3

2√3

2

Answer 1

well sin k = 5 / 10 = 1/2
so what is k?
do you know that sin of which angle would be 1/2?

Answer 2

Sin = Opposite/Hypotenuse,

K is your reference angle for the triangle, which means:

sin(k) = o/h
sin(k) = 5 / 10
sin(k) = 1/2

http://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Unit_circle_angles_color.svg/720px-Unit_circle_angles_color.svg.png

Look at this unit circle, and look at the 2nd number for each angle

Answer 3

but @larryboxaplenty , that circle is a liitle confusing for her i think...;)

Answer 4

It can be confusing. sin(30 degrees) is always 1/2
Likewise, sin(30+180 degrees) is also 1/2, because the angle just made one rotation.

Answer 5

yes but have u ever seen 210 degrees in a triangle ?

Answer 6

You should know the sin, cos, and tan of the following degrees:

0, 30, 45, 90. (I think I may be missing one).

If you know these, everything else repeats if they perfect numbers like these

Answer 7

If you are dealing with angles such as 210 degrees, then the values will be different.

Answer 8

*200 degrees