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How do you do this? it's an exterior angle.

How do you do this? it's an exterior angle.-example-1

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Let the unknown angle inside the triangle = a
La = 180 - (64 + 76)
La = 180 - 140
La = 40°

Now to the k.
K is an exterior angle.
Lk + La = 180°
180° - 40° = Lk
= 140°
User Walter Roman
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