Answer:
115°
Step-by-step explanation:
The external angle of a triangle is equal to the sum of the 2 opposite interior angles.
? is an exterior angle of the triangle , thus
? = 75° + 40° = 115°
[tex]x = 115 \: \: degrees[/tex]
let's get the missing side as x
[tex]75 + 40 = x \\ 115 = x[/tex]
