Ileen03 Ileen03
  • 27-05-2017
  • Mathematics
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mreijepatmat
mreijepatmat mreijepatmat
  • 27-05-2017
Note that 2n° & the opposite angle of 2n° (vertical angle) are congruent, let's call it angle A, so A°=2n°

We also notice that angle A° + (n+18)° = 90°

Solve for n:(don't forget that A° =2n°) ==>   2n° + (n + 18)° = 90°,  

3n° = 90°-18° ==> 3n° = 72° and n° = 24°
So if n=24°, 2n=48°


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