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Listed under:  Mathematics  >  Geometry  >  Angles  >  Parallel line angles  >  Co-interior angles
Moving Image

A cosy relationship between lines and angles

Which pairs of angles are the same when two lines intersect? What do you know about angles formed when a line intersects two parallel lines? Test your knowledge of geometric terms 'congruent', 'parallel', 'transversal' and 'corresponding', 'alternate' and 'co-interior' angles.

Moving Image

Get your bearings using trig!

Apply your understanding of compass points (north, south, east and west) and trigonometry to solve problems about bearings and direction. Follow the steps of working out what the question is asking and drawing a labelled diagram. See how to go about solving the problem by using the correct trig ratio. In the second of these ...

Interactive resource

Exploring relationships of angles

Explore angles formed by a transversal line intersecting parallel lines. Look at illustrations showing pairs of angles: vertically opposite, corresponding and alternate angles. Name pairs of angles to score points and help a monkey drive to the supermarket to buy food.

Teacher resource

TIMES Module 26: Measurement and Geometry: circle geometry - teacher guide

This is a 44-page guide for teachers. It contains theorems on chords, arcs, angles and secants associated with circles.

Teacher resource

Starting Smart: how are shapes and objects related?

This curriculum resource package is a ten-week middle years teaching plan and set of supporting resources to extend students' understanding of geometrical language and spatial relationships. Students use concrete materials and interactive geometry software packages to compare and describe geometrical attributes and investigate ...


BBC Bitesize: intersecting and parallel lines - revision

These illustrated information sheets review the definition of intersecting and parallel lines, and angle facts for vertically opposite, alternate, corresponding and co-interior angles. A test that provides immediate feedback can be used for further consolidation. This resource is one of a series of online resources from ...

Teacher resource

Geometric reasoning including parallel lines and angle sum of a triangle

This is a website designed for both teachers and students that addresses geometry from the Australian Curriculum for year 9 students. It contains material on geometry and includes information regarding parallel lines and the angle sum of triangles. There are pages for both teachers and students. The student pages contain ...