Which figures are congruent, parallel, and perpendicular?

Parallel lines or line segments never intersect.

Here we see that segments AB and ST are parallel.

Perpendicular lines or line segments intersect at a 90 degree angle.

Here we see that KL is perpendicular to IJ.

I hope it helps!

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step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2