How many sides, edges, does the shape have?
First, we think about what the definition of sides or edges is. The sides are the line segments or the lines that make up a flat shape. Let’s highlight those sides in blue: one, two, three. This shape has a total of three sides. Another word for sides is edges. We can also say that this shape has three edges. Three-sided flat shapes are called triangles. This shape has three sides.