Parts of a Triangle: Classify a triangle by its sides

To solve this problem, we'll follow these steps:

• Step 1: Identify the given information about the triangle.
• Step 2: Use the properties of triangles to classify the triangle based on its sides.

Now, let's work through each step:
Step 1: The problem states that $AB = AC$. This means two sides of the triangle are equal.
Step 2: In triangle classification by sides, if two sides are equal, it is known as an isosceles triangle.

Therefore, the type of triangle we are dealing with here is an isosceles triangle.

The correct multiple-choice selection is: Isosceles (choice ID 2).

To solve this problem, we'll follow these steps:

• Step 1: Identify the given information
• Step 2: Apply the properties of triangles to classify it

Now, let's work through each step:
Step 1: The triangle is given with sides $AB$ and $BC$ equal in length.
Step 2: According to the properties of triangles, a triangle with at least two equal sides is classified as an isosceles triangle.
Therefore, given that $AB = BC$, the triangle is an Isosceles triangle.

Therefore, the solution to the problem is Isosceles.