Respuesta :

Unknownbeinghere

Answer:

90,105,75

Step-by-step explanation:

let the angle be x

so,

6x+7x+5x = 3×90

18x = 270

x= 270/18

x = 15

so the angles are , 6x = 90 , 7x = 105 , 5x = 75

hope it's helpful to you ☺️