Respuesta :

Answer:

60

Step-by-step explanation:

hello there!

If you didn't know an exterior angle of a triangle is equal to the sum of its opposite interior angles

to be more specific ∠5=∠4+∠3

we are given ∠5 and ∠4 and we need to find ∠3

So we plug in what we have and solve for ∠3

130 = 70 + ∠3

subtract 70 from each side

130 - 70 = 60

we're left with ∠3 = 60

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