In this deck, we'll explore the properties of angles inside shapes, which are called polygons. We'll start with the basics, like triangles and quadrilaterals, and then learn rules that work for any polygon, no matter how many sides it has.

Let's begin with the simplest polygon, the triangle. A key rule to remember is that the three interior angles inside any triangle always add up to the same total. This is true whether the triangle is long and thin, or short and wide.

Some triangles have special properties. An equilateral triangle has three equal sides and, as a result, three equal angles. Since the total is 180 degrees, we can easily work out the size of each angle.

Another special type is the isosceles triangle. This has two equal sides. The two angles at the base of these equal sides are also equal to each other.