Step-by-step explanation:
"If the sum of 2 angles is 180°, then each is the supplementary angle of the other".
C because the two angles add to 180° making it supplementary
Law of sines in a triangle with angles A, B, C and sides a,b,c states that
(sin A)/a =(sinB)/b = (sinC)/c
To use the above ratios, you need at least one angle and one side and one of either an angle or a side. So SSS and AAA don't work
