Co-interior angles are on the same side of the transversal line and in between the two other lines.

Co-interior angles

Maths

Checking understanding of angles from KS2

Securing understanding of angles from KS2

Formalising understanding of triangles from KS2

Formal angle notation

Corresponding angles

Alternate angles

Angles on parallel lines traversed by a straight line

The sum of the interior angles of any triangle

Using the sum of the interior angles of a triangle

Interior angles of a polygon

Deriving the sum of interior angles in multiple ways

Exterior angles of polygons

Interior and exterior angles of regular polygons

Missing angles

Problem solving with polygons

This unit gives pupils the opportunity to explore polygons and begin to generalise their understanding of interior/exterior angles in regular polygons. In the future unit, pupils will use the geometrical properties of a rhombus to perform various constructions

In this unit, pupils learnt how to calculate with angles at a point and angles on a straight line. In this unit, pupils extend their knowledge about angles in lines

In this unit pupils will investigate internal and external angles of polygons and angles made with a transveral and parallel lines. Pupils will develop their ability to formally prove properties of polygons to generalise.

Geometrical properties: polygons

Co-interior angles are on the {{ }} side of the transversal line and in between the two other lines.

Which of these diagrams show co-interior angles?

If the co-interior angles are in parallel lines then the angles are {{ }}.

The angle marked $$n$$° is {{ }}° as $$n$$° and 118° are supplementary co-interior angles.

Use this diagram to match pairs of supplementary co-interior angles.

The value of the angle marked $$a$$ is {{ }}°.

The value of the angle marked $$x$$ is {{ }}°.

Which pair of line segments are equal in length in this diagram?

Alternate angles are a pair of angles both between or both outside two line segments that are on opposite sides of the {{ }} that cuts them.

Which of the following show a pair of equal corresponding angles?

Co-interior angles

Lesson outcome