Respuesta :

the 3 inside angles of a triangle need to = 180 degrees
 you are given 70 and 80 which = 150 degrees  ( 70 +80 = 150)

so the missing angle (PQR) = 180 - 150 = 30 degrees

i believe its 30 rn im taking that question aswell if it isnt 30 ill tell you what it is