Identify different types of triangle

Maths

In this unit pupils will pupils will complete and compose symmetrical shapes from two congruent shapes and investigate lines of symmetry in 2D shapes. In the future unit pupils will explain what area is and measure using counting as a strategy. They will make different shapes with the same area and compare the area of different shapes. 

In the prior unit pupils investigated ways to compose and decompose polygons. They investigated quadrilaterals with and without parallel and perpendicular sides. In this unit pupils will complete and compose symmetrical shapes from two congruent shapes and investigate lines of symmetry in 2D shapes.

Properties of 2D and 3D shapes and symmetry

A right-angled triangle has one 90° angle. Right-angled triangles can be classified as isosceles or scalene.

Explore, sort and classify triangles

When a shape has a line of symmetry, it can be described as symmetrical.

Another term for a line of symmetry. If you were to fold a shape on its line of symmetry, both halves would match exactly.

If you were to fold a shape on its line of symmetry, both halves would match exactly.

Complete a symmetrical pattern

When a shape, pattern or image has two halves that match exactly when folded, it can be described as symmetrical.

If you were to fold a shape at its line of symmetry, both halves would match exactly.

Two shapes that are exactly the same can be described as identical.

Explore symmetry by joining two identical shapes

A quadrilateral with two pairs of adjacent, equal sides.

Investigate lines of symmetry in 2D shapes by folding

When a shape, pattern or image has one half that is the reflection of the other half, it can be described as symmetrical.

A regular polygon has sides that are all equal and angles that are all equal.

Find lines of symmetry in 2D shapes

When you reflect a shape, you flip it over a mirror line or line of symmetry without turning it or changing the size.

Properties of 2D and 3D shapes and symmetry

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These lessons will be removed by end of Summer Term 2025.