Answer:
c and d
Step-by-step explanation:

Given that,
<em>In triangle ABC</em>


We know,
Sum of all interior angles of a triangle is supplementary.

<u>On adding equation (1) and (2), we get </u>





On substituting the value in equation (1) and (2), we get



Also, from equation (2), we get



Hence,

See the explanation
<h2>
Explanation:</h2><h2>
</h2>
Here we have the following points:

The point-slope form of the equation of a line is:

So the slope can be found as:

So:

So the equation is finally:

This line passes through and is shown below.
<h2>Learn more:</h2>
About lines: brainly.com/question/14427236#
#LearnWithBrainly
Answer:
Step-by-step explanation:
2π/3 radians is equivalent to
2π 180°
-------- * ---------- = 120°
3 π rad
This angle (120°) is 30° past 90°. The 'opposite side' of the triangle formed by this ray of length 1 is √3 and the 'adjacent side' is 1.
adj side -1
cos 120° is in Quadrant II. cos 120° = --------------- = ---------
hyp 2
√3
and sin 120° = --------
2