zanarouse123 zanarouse123
  • 15-10-2019
  • Mathematics
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how do you do this ​

how do you do this class=

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jdoe0001 jdoe0001
  • 15-10-2019

let's recall that the sum of all interior angles in a triangle is 180°, so then

[tex]\bf \stackrel{\measuredangle A}{x}+\stackrel{\measuredangle B}{(x+40)}+\stackrel{\measuredangle C}{30} ~~=~~ 180\implies 2x+70=180 \\\\\\ 2x=110\implies x=\cfrac{110}{2}\implies \stackrel{\measuredangle A}{x} = 55[/tex]

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