Question

what is the included angle between sides ab and ac in △abc?
a. ∠bac
b. ∠abc
c. ∠bca
d. ∠acb

Explanation:

Step1: Recall the definition of included angle

The included angle between two sides of a triangle is the angle formed by those two sides.

Step2: Identify the sides \(AB\) and \(AC\)

In \(\triangle ABC\), the sides \(AB\) and \(AC\) meet at vertex \(A\).

Step3: Determine the angle at vertex \(A\)

The angle at vertex \(A\) is denoted as \(\angle BAC\).

Answer:

a. \(\angle BAC\)