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1:  In triangle ABC, the measure of angle A is x degrees, the measure of angle B is 2x degrees and the measure of angle C is 5x degrees. What is the value of x? Express your answer as a decimal to the nearest tenth.


2:  Find the value of x in the diagram below.

Thanks so much!

 Jan 24, 2018

1). The sum of the angle measures of a triangle  = 180°


This implies that :


x + 2x  + 5x   = 180


8x  =  180       divide both sides by 8


x  = 180/8  =  22.5” 


2)   The angle marked  x°  is supplemental to the 75°  angle....this is because a transversal that cuts parallel  lines makes corresponding angles equal




x  +  75  =  180          subtract 75  from both sides


x  = 105°




cool cool cool

 Jan 24, 2018

Thank you so much!  I think I'm getting the hang of this now...  Probably won't need help for a while!

AnonymousConfusedGuy  Jan 24, 2018

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