DeepMaths / Fun Maths

Fun Maths Book 2 Online Learning Programme

For Year 4 and Year 5

Chapter 7: Geometry, Angles, and Coordinates

Geometry, Angles, Coordinates and 3D Shapes

Use precise geometry words and read coordinates in the correct order.

Fun Maths Book 2 pages 90-1035 minutes

AI teacher

Press Start to hear a short classroom-style explanation. If sound is unavailable, the full script is shown below.

Voice: Browser voice

Workbook pages

Fun Maths Book 2 pages 90-103

Identify angle types, triangles, quadrilaterals, coordinates, 3D shapes and nets.

AI explanation

The AI teacher shows angles opening from a vertex, then sorts triangles and quadrilaterals by their properties. Coordinates are introduced as across first, then up or down.

  1. 1An angle is made when two lines meet at a point.
  2. 2A right angle is exactly 90 degrees.
  3. 3Coordinates are read across first, then up.
  4. 4A net is a flat pattern that folds into a 3D shape.

Think with the AI teacher

Today we will use geometry words precisely. Good geometry starts by noticing properties and reading diagrams carefully.

Question 1

Pause 4s

What changes when an angle opens wider?

After thinking

The amount of turn increases.

Good observation. An angle measures turn.

Question 2

Pause 4s

In the coordinate (6, 2), which number tells us to move across?

After thinking

The first number, 6, tells us to move across.

Yes. Across first, then up.

Question 3

Pause 5s

How can a flat net become a 3D shape?

After thinking

The faces fold along edges until they meet to make a solid.

Excellent visual thinking.

Deep structure

What children discover

Children discover that geometry depends on properties: angles, sides, positions, faces and how shapes transform between flat and solid forms.

Common mistake

Children may reverse coordinates or classify an angle by how it looks rather than by its size.

Future connection

Geometry language supports transformations, vectors, construction, loci, coordinate geometry and trigonometry.

TransformationsVectorsCoordinate geometryTrigonometry

Animated demonstration

See the maths move

An angle arm rotates through acute, right, obtuse and reflex positions, then points land on a coordinate grid and fold into a cuboid net.

A rotating arm shows angle size, a point lands on a coordinate grid, and a flat net links 2D diagrams to 3D shapes.
angle(3, 3)
acuterightobtusereflex

Guided examples

Angle type

Classify an angle of 128 degrees.

  1. 1.Compare 128 degrees with 90 degrees.
  2. 2.It is greater than 90 degrees but less than 180 degrees.
Answer: Obtuse angle

Coordinates

Plot the point (4, 3).

  1. 1.Start at the origin.
  2. 2.Move 4 spaces across on the x-axis.
  3. 3.Move 3 spaces up on the y-axis.
Answer: The point is 4 across and 3 up.

Interactive practice

Try it now

Say 'across first, then up' before plotting every coordinate point.

0/3 correct

What type of angle is 90 degrees?

In the coordinate (6, 2), which number tells how far across?

A cube has how many square faces?

Review

Say the rule for reading coordinates before attempting the coordinate pages.

Classify one angle, plot one coordinate, and name one 3D shape property.

Parent signal

If points are plotted wrongly, ask the child to say 'across first, then up' aloud.

Great geometry thinking. Precise words make precise diagrams.