Question

please solve it
i will follow

Answer 1

Answer:

here,

op||qr and ab is a transversal

so,

OAB=ABC( alternate interior angle)

a= 60°

now ac is a transversal

c +RCA =180°(co - interior angle)

c= 70°

OAC=RCA(alternate interior angle)

60°+b=110°

b=50°