Hi! Let's learn about Dimensions

In Geometry we can have different dimensions.

Let us start with a point.

Can't see it? Well it has no size, so we will highlight it.

Now lets allow the point to move in one direction.

We get a line.

We need just one value to find a point on that line. So we have one dimension.

A line is one-dimensional.

Now lets allow the point to move in another direction. And we get a plane.

We need two values to find a point on that plane. So we have two dimensions. We call it 2D.

A 2D object is flat.

Circles, triangles, squares and more are two-dimensional.

We also call them plane shapes.

Now we let that point move in another completely different direction and we have three dimensions.

Spheres, cubes, cylinders and more are 3-dimensional.

We also call them solid shapes.

We can have more dimensions, but I can't draw them.

In Physics Time can be thought of as a dimension, but not in Geometry.