How many sides does this shape have?
First, we need to think about the word “sides.” What does the word “sides” mean when we’re talking about shapes? The sides of a shape are the line segments that make up that flat shape.
Let’s highlight the sides of this shape: one, two, three. This shape has three sides. And that means we call it a triangle because triangles are three-sided flat shapes. How many sides does the shape have? Three.