Question

3 one please if you can

Answer 1

a+b=180°[linear pair]
a-b=80

2a=260
a=130°

hence b=180-130=50°

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Answer 2

here angle POR and angle QOR form linear pair then

a+b=180 ...equ1

here given a-b=80....equ2

from equation 1 and 2 addtion
then L.h.s to l.h.s and r. h. s to r. h. s

then a+a=180-80

2a=100
a=50

we know a+b=180
50+b=180
b=180-50
b=130

HOpE it will help full and mark it brainliest answer