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Welcome to geometry! Together we're going to learn about a wide variety of 2-dimensional
and 3-dimensional shapes. Some of the flat, 2-dimensional shapes will have straight edges
- like triangles or pentagons - while some of them will be curved - like circles and
ellipses. For all these 2-dimensional shapes we'll learn how to measure their angles, compute
their areas, and find the distance around the shapes: their perimeters. Next we'll move
on to the 3rd dimension and look at solid shapes, like spheres, cones and boxes. For
those shapes we'll learn how to calculate the outside area, and compute the volumes.
We are surrounded by shapes. Everywhere you look you see flat and solid shapes. So it's
no surprise that geometry is one of the oldest subjects of all. People have been studying
it for over 2000 years. In fact, a Greek man named Euclid wrote a book called The Elements
which was used to teach geometry for hundreds of years. For this reason, the geometry WE
will learn is often called Euclidean geometry. There are other types of geometries called
non-Euclidean geometries. We won't talk about those. Instead, we'll focus on Euclidean geometry.
There's a lot to learn, so I'll see you in the next video.