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grigory [225]
3 years ago
8

How do you do this ​

Mathematics
1 answer:
Eduardwww [97]3 years ago
4 0

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

\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

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