Angles in polygons

In this lesson, we will learn about the interior angles in a triangle, and how to find unknown angles in various types of triangles.

In this lesson, we will learn about the key terminology involved in describing polygons, and begin to categorise polygons, based on certain properties.

In this lesson, we will learn how to arrange triangles to form polygons as part of an investigation into the internal angles of polygons. This represents part 1 of a two-part lesson.

In this lesson, we will learn how to arrange triangles to form polygons as part of an investigation into the internal angles of polygons. This represents part 2 of a two-part lesson.

In this lesson, we will learn that the sum of the interior angles of a polygon can be found using triangles.

In this lesson, we will learn how to generalise the sum of the interior angles in an n-sided polygon.

In this lesson, we will learn how to apply the generalisation of the total interior angles in an n-sided polygon.

In this lesson, we will learn how to find an unknown angle in a polygon.

In this lesson, we will learn about exterior angles, and how they sum to 360 degrees.

In this lesson, we will learn how to calculate the mean interior and exterior angles of n-sided polygons, and solve problems based on these formulae.

In this lesson, we will combine everything learnt so far about angles in polygons to compare how specific examples relate to generalised cases.

In this lesson, we will learn about how to problem solve with angles in polygons, along with learning notations for referring to angles.