Respuesta :

It’s 40° because if you do 65+75 you get 140 and so all triangles must equal 180°, you just have to minus 140 from 180 to equal 40°

Answer:

40°  

Step-by-step explanation:

65° + 75° = 140°

180° - 140° = 40°

Further explanation:

You add 65° and 75° you get 140°.

All triangles must equal 180°, you subtract 140° from 180° and that equals 40°.