Which of the following shapes is not a polygon?

Which of the following shapes is not a polygon?

Step 1: Understand what a polygon is. A polygon is a shape that has straight edges and is closed (it starts and ends at the same point).
Step 2: Identify the shapes given in the question. Look for shapes like triangles, squares, rectangles, and circles.
Step 3: Check if each shape has straight edges. A triangle has 3 straight edges, a square has 4 straight edges, and a rectangle has 4 straight edges.
Step 4: Look at the circle. A circle does not have any straight edges; it is curved all the way around.
Step 5: Conclude that since a circle does not have straight edges, it is not a polygon.

No concepts available.