# Unit Overview: Angles in polygons

## Lessons:

12 lessons

### Interior angles in a triangle

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

• 1 Quiz
• 14m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Categorising and defining polygons

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

• 2 Quizzes
• 6m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Building shapes from triangles (Part 1)

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.

• 2 Quizzes
• 9m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Building shapes from triangles (Part 2)

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.

• 2 Quizzes
• 13m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Polygons and triangles

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

• 2 Quizzes
• 13m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Generalising angles in polygons (Part 1)

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

• 2 Quizzes
• 12m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Generalising angles in polygons (Part 2)

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

• 2 Quizzes
• 13m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Finding missing angles in polygons

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

• 2 Quizzes
• 17m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Exterior angles

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

• 2 Quizzes
• 11m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Regular interior and exterior angles (and mean of irregular)

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.

• 1 Quiz
• 17m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Generalising and comparing generalisations

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

• 2 Quizzes
• 15m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Angle notation and problem solving

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

• 2 Quizzes
• 15m Video
• Presentation(PPT)
• Worksheet
• Transcript