Sides and Vertices

Count sides and corners (vertices).

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 68

This is a triangle. Its straight lines are called sides. A triangle has 3 sides.
Your turn! Tap each side of this square to count them.
A square has 4 sides. Where two sides meet, there's a corner. A corner is called a vertex. More than one are called vertices.
Tap each vertex of this shape to count them!
5 vertices, and 5 sides too! A shape always has the same number of sides and vertices.
A circle is round all the way around. It has no straight sides and no vertices.

Georgia's K-12 Mathematics Standards:

2.GSR.7.1 — Describe, compare and sort 2-D shapes including polygons, triangles, quadrilaterals, pentagons, hexagons, and 3-D shapes including rectangular prisms and cones, given a set of attributes.