If $AB=BC$ and $B$ is midpoint of $AC ,$then $A,B,C$are

Given:

• AB = BC
• B is the midpoint of AC

Implications:

• B being the midpoint of AC means that AB + BC = AC, and AB = BC.
• This implies A, B, and C lie on the same straight line since B divides AC into two equal segments.

Conclusion:

• A, B, and C are collinear.