# Cool math.com - The Geometry of Triangles

The Geometry of Triangles. Definitions and formulas for the area of a triangle,. This formula will help you find the length of either a, b or c.
Polygons. A Polygon is a 2-dimensional shape made of straight lines. Triangles and Rectangles are polygons. Here are some more: The Circle, circle Theorems (Advanced Topic symbols, there are many special symbols used in Geometry.
Online geometry video lessons to help students with the formulas, terms and theorems related to triangles, polygons, circles, and other geometric shapes to improve.
Let us start with some of the simplest shapes: Common 3D Shapes, polyhedra and Non-Polyhedra, there are two main types of solids, "Polyhedra and "Non-Polyhedra Polyhedra : (they must have flat faces) Non-Polyhedra : (if any surface is not flat).
Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math.
Shapes that can be drawn on a piece of paper. Solid Geometry is about three dimensional objects like cubes, prisms, cylinders and spheres. Hint: Try drawing some of the shapes and angles as you learn.
Geometry Help - Definitions, lessons, examples, practice questions and other resources in geometry for learning and teaching geometry.
To discover patterns, find areas, volumes, lengths and angles, and better understand the world around us. Plane Geometry, plane Geometry is all about shapes on a flat surface (like on an endless piece of paper).