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Why triangular numbers make triangles

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Patterns in Mathematics · Build triangular numbers · 3:58

You'll learn: Connect an arrangement to its count

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Why triangular numbers make triangles

You'll learn: Connect an arrangement to its count

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Build triangular numbers

1

3:47
Growing a triangular arrangement
You'll learn: Calculate a new total from the previous total

Next topic

Build square numbers

1

3:59
Why square numbers make squares
You'll learn: Count equal rows and columns

Next topic

Patterns in Mathematics

3

Mathematics Begins With Patterns and Explanations
4:17
Mathematics Begins With Patterns and Explanations
You'll learn: Mathematics Begins With Patterns and Explanations
A Sequence Can Stay the Same or Grow
3:59
A Sequence Can Stay the Same or Grow
You'll learn: A Sequence Can Stay the Same or Grow
Odd and Even Numbers Grow by Two
4:05
Odd and Even Numbers Grow by Two
You'll learn: Odd and Even Numbers Grow by Two

Next topic

Distinguish a point and a line segment

2

A point tells us where
3:18
A point tells us where
You'll learn: Understand a point as an exact location
A straight connection between two points
3:20
A straight connection between two points
You'll learn: Recognise a segment and its endpoints

Next topic

Distinguish a ray and a line

2

A ray starts here and continues
3:19
A ray starts here and continues
You'll learn: Recognise one starting point and a direction
A line continues in both directions
3:29
A line continues in both directions
You'll learn: Distinguish lines, rays and segments

Next topic

Name geometric objects correctly

2

Read and name a geometry diagram
3:25
Read and name a geometry diagram
You'll learn: Name points, segments and lines correctly
The starting point comes first for a ray
3:12
The starting point comes first for a ray
You'll learn: Explain why ray names have an order

Next topic

Understand an angle as an opening

3

An angle measures an opening
3:26
An angle measures an opening
You'll learn: Identify an angle in a physical setup
The vertex and arms tell us which angle
3:20
The vertex and arms tell us which angle
You'll learn: Name an angle with its vertex in the middle
An angle is an amount of turn
3:21
An angle is an amount of turn
You'll learn: Connect an opening to rotation

Next topic

Compare angles despite different arm lengths

1

Longer arms do not make a larger angle
3:32
Longer arms do not make a larger angle
You'll learn: Compare the opening rather than the drawn lengths