Question

the included side between ∠a and ∠c is side
the included side between ∠a and ∠b is side
the included side between ∠c and ∠b is side
ab
ac
bc

Explanation:

Step1: Recall included - side definition

The included side between two angles of a triangle is the side that is common to both angles.

Step2: Find side between ∠A and ∠C

The side common to ∠A and ∠C is AC.

Step3: Find side between ∠A and ∠B

The side common to ∠A and ∠B is AB.

Step4: Find side between ∠C and ∠B

The side common to ∠C and ∠B is BC.

Answer:

The included side between ∠A and ∠C is side AC.
The included side between ∠A and ∠B is side AB.
The included side between ∠C and ∠B is side BC.