### Angles in triangles

In this lesson, we will review that the internal angles in a triangle sum to 180 degrees.

Skip navigation# Unit Overview: Angle review (9.5a)

## Lessons:

### Angles in triangles

### Angles in polygons

### Straight line angles and angles around a point

### Angles in parallel lines

4 lessons

In this lesson, we will review that the internal angles in a triangle sum to 180 degrees.

In this lesson, we will review that the total interior angles of polygons are made up of many triangles, and that this relationship is determined by the number of sides the polygon has.

In this lesson, we will review how straight line angles sum to 180 degrees, and how angles around a point sum to 360 degrees.

In this lesson, we will review the various angle facts that appear with a transversal and parallel lines.

Units in Maths

- Numbers and numerals
- Axioms and arrays
- Factors and multiples
- Order of operations
- Positive and negative numbers
- Expressions, equations and inequalities
- Angles
- Classifying 2-D shapes
- Constructing triangles and quadrilaterals
- Coordinates
- Area of 2-D shapes
- Transforming 2-D figures
- Prime factor decomposition
- Conceptualising and comparing fractions
- Manipulating and calculating with fractions
- Ratio
- Percentages
- Different number systems
- Sequences
- Forming and solving equations
- Forming and solving inequalities
- Linear graphs
- Accuracy and estimation
- Algebra and problem solving
- Ratio (8.6a)
- Ratio, real life graphs, and rates of change
- Direct and indirect proportion
- Univariate data
- Bivariate data
- Famous maths problems
- Angles and parallel lines
- Angles in polygons
- Bearings
- Volume and surface area of prisms
- Area review
- Circles
- FDP review (9.1a)
- Probability
- Sets and Venn Diagrams
- Solving linear simultaneous equations algebraically
- Solving linear simultaneous equations graphically
- Angle review (9.5a)
- Constructions, congruence, and loci
- Pythagoras's theorem
- Famous maths problems
- Ratio review (9.7a)
- Similarity and enlargement
- Surds and trigonometry
- Quadratic expressions (9.9)
- Quadratic equations (9.10)
- Indices and standard form
- Growth and decay
- Finance