solana1
solana1 solana1
  • 15-10-2016
  • Mathematics
contestada

does anyone know how to sovle this

does anyone know how to sovle this class=

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apologiabiology
apologiabiology apologiabiology
  • 15-10-2016
the 2 interior angles add to the exterior angle
26+13=x
39=x

x=39°

because

remember, all angles add to 180
26+13+BCA=180
39+BCA=180
minus 39 both sides
BCA=141
look, we want x

BC is a striaign line which is 180
BCA+x=180
141+x=180
minus 141 from both sides
x=39°
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