Answer:
60
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