Question

in $\triangle abc$, $ab = 12$ mm, $ac = 7$ mm, and $bc = 9$ mm. which angle is the smallest?
a $angle a$
b $angle b$
c $angle c$

Explanation:

Step1: Recall angle - side relationship

In a triangle, the smallest angle is opposite the shortest side.

Step2: Identify shortest side

The shortest side is $AC = 7$ mm.

Step3: Determine opposite angle

The angle opposite $AC$ is $\angle B$.

Answer:

B. $\angle B$