Mathematics

Problem

At a point

O

, rays

OA

OB

and

OC

are drawn so that

OB

is the common arm of two adjacent angles. If

\angle AOB = 70^{\circ}

and

\angle BOC = 110^{\circ}

, which of the following statements is correct? a)

OB

and

OC

are perpendicular. b)

OB

and

OC

are collinear. c)

OA

and

OC

are collinear. d)

OA

and

OB

are collinear.