An introduction into the laws used with circle theorems. I have ran this lesson numerous times. The note taking (by the students) works really well if they have a print out with blank circles and space around for note taking. Each theorem is taken one at a time, notes taken, examples gone through and followed by students practising.

Chapter 17- Circle Theorems

Power Point presentation, 25 slides, Explaining with examples the following circle theorems: The angle in a semicircle, The chord of a circle, Radius-tangent, Tangents from an external point, The angle at the centre, Angles subtended by the same arc, Opposite angles in a cyclic quadrilateral. For a preview of the power point copy the following link on your browser: https://drive.google.com/file/d/0B8z00qLZV7OlZFc4blpDVGpuc3c/view?usp=sharing

These slides algebraiclly prove the circle theorems used at GCSE.

4 worksheets: Angles in a semi circle Same Segment Centre and the circumference Cyclic Quadrilaterals

A sheet of circle theorems I created for my GCSE class to stick in their exercise books, which they can refer back to.

Circle Theorems Review / Revision Lesson. Suitable for a ‘mastery’ teaching approach. Includes identifying features of a circle starter. Circle theorem rules match up reasoning activity. Group and individual fluency exercises. ‘Tick or trash’ student assessor plenary.

A collection of GCSE exam questions on Circle Theorems.

Circle Theorem Rules Matching Activity Match 8 diagrams to the Circle theorem description. Differentiated activity - 3 options. 1) Match the cards 2) Match the cards and fill in key words. 3) Write the rules from memory.

Circle Theorems - no reasons required. Generated by Mathster.com under the Share-Alike license.

An extension of a NRich problem whereby students investigate a 10 dot circle (printout available from NRICH under printable resources). The problem begins by consolidating isosceles triangles within a 10 dot circle. The problem then moves into exploring a series of circle theorems using the triangles they found from the first 2 problems. Once students have done this they have the basis from which to generalise circle theorems.

This lesson and worksheet looks at the knowledge of the angles contained in a semicircle. This is done through worked examples followed by a worksheet for students to attempt.

Display posters explaining Circle Theorems with proofs. Now in white and red

Full GCSE and iGCSE coverage of circle theorems, with worked examples, proofs, helpful tips and summary sheets. Ideal for revision or teaching purposes. Step by step guidance - you control the speed, allowing time to process the information. *** if you find it useful, please give it a review!***

GCSE Circle Theorems explained in this lesson with all 7 theorems shown through beautifully clear animations and also have questions and answers for practice.

THIS WORKSHEET CONTAINS QUESTIONS ABOUT CIRCLE THEOREMS

Learning Objectives: - Apply and prove the standard circle theorems concerning angles, radii, tangents and chords, and use them to prove related results

Circle Theorem