Myths about teaching can hold you back
- Year 8
Co-interior angles
I can recognise that a pair of parallel lines traversed by a straight line produces supplementary co-interior angles.
- Year 8
Co-interior angles
I can recognise that a pair of parallel lines traversed by a straight line produces supplementary co-interior angles.
Lesson details
Key learning points
- Co-interior angles can be identified in an arrangement of 3 line segments.
- If two of the lines are parallel then these angles are supplementary.
- Knowledge of co-interior angles can be used to find unknown angles.
- Knowledge of co-interior, corresponding and alternate angles can be used to find unknown angles.
Keywords
Co-interior - Co-interior angles are on the same side of the transversal line and in between the two other lines.
Common misconception
Pupils may believe that the co-interior angles are equal, like alternate and corresponding angles.
Have pupils draw a pair of parallel lines and a transversal line themselves, identify the co-interior angles, are they equal?
To help you plan your year 8 maths lesson on: Co-interior angles, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 8 maths lesson on: Co-interior angles, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 maths lessons from the Geometrical properties: polygons unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.The value of the angle marked $$a$$ is °.
Q2.The value of the angle marked $$x$$ is °.
Q3.Work out the value of $$m$$.
Q4.Which pair of line segments are equal in length in this diagram?
Q5.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.
Q6.Which of the following show a pair of equal corresponding angles?
Assessment exit quiz
6 Questions
Q1.Co-interior angles are on the side of the transversal line and in between the two other lines.
Q2.Which of these diagrams show co-interior angles?
Q3.Which pairs of angles are co-interior?
Q4.If the co-interior angles are in parallel lines then the angles are .
Q5.The angle marked $$n$$° is ° as $$n$$° and 118° are supplementary co-interior angles.
Q6.Use this diagram to match pairs of supplementary co-interior angles.
c -
f
d -
e
o -
j
p -
i
h -
k
a -
n