# Geometry

Contents

Geometric shapes are all around us. The world is built with them. In this series of tutorials and exercises you'll become familiar with Euclidean geometry and terms like segments, scale drawings, parts of a circle, area, volume, angles, and geometric figures.

A circle is at the foundation of geometry, and at the foundation of a circle is a special number called Pi. This number allows us to relate the radius, diameter, and circumference of a circle.

Problems that stretch your understanding of area and circumference of circles

Learn three types of angle pairs: vertical angles, complementary angles, and supplementary angles.

Practice finding missing angles in figures using your knowledge of vertical, supplementary, and complementary angles.

Let's practice making triangles and start thinking about when it's possible or impossible to make a triangle.

When we slice (cut through) a 3D shape, we make a 2D shape called a cross section. In this tutorial, we think about the different cross sections we can make by slicing 3D shapes.

A map depicts objects much smaller than they are in real life. A map is a great example of a scale drawing. In this tutorial, we'll take a mathematical look at the nature of scale drawings.