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Vector Proof

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Linked to the defining vectors activity, using the vectors defined in the image to prove standard results like ratios of line segments, whether points lie on straight lines, etc. For extra challenge take out the image with the pre-defined vectors and add the image from my vector definition activity so that pupils have to define the vectors before using them. Answers can be found on the prezi at link https://prezi.com/lenmenrpi1li/vector-proof/
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Angles in a Triangle Proof

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Lesson on angles in a triangle proof, created in connection to my school's new scheme of work based upon the new National Curriculum.
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Algebraic proof revision

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A worksheet on the different types of algebraic proof questions on the Edexcel GCSE exams. I am getting to the stage with my year 11s that they need to be revising individualised topics rather than me teaching the whole class. I have designed this for them to work independently, without relying on my help. It contains examples and practice questions. Answers included. I hope this is useful! Please look at my other revision resources.
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IGCSE Further Maths - Algebraic Proofs and Geometric Proofs

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Covers algebraic and geometric proofs within the AQA IGCSE Further Maths Level 2 syllabus. Also covers identities.
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GSCE Maths: Proofs of Pythagoras' therom lesson

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Although presented as a demonstration, the key point of the geometric exercise is that pupils construct their own copy with paper, pencil and a pair of scissors. They should also be invited to discuss and construct the algebraic proof, preferably in pairs or small groups. A 'click and watch' approach will not enable pupils to gain a deep understanding of either proof.
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Simplifying Expressions and Formulae

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This takes you from the most basic simplifying up through substitution and proof of formulae.
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Proofs

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Print out the powerpoint slides to use as review cards for algebraic proof. Alternatively use them as a teacher resource. The handout has six questions with worked solutions.
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Angles in a triangle. Geometry.

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A visual proof of why the angles in a triangle sum to 180 degrees.
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Othello: Interactive Lesson: What Is Proof?

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This set of interactive lesson resources and interactive lesson plan to illustrate the concept of proof, not by well-known mathematical methods, but via an example in literature, namely, Shakespeare’s Othello, the first scenes of Act One. Teacher asks questions, and students try to find out the next step in the drama. Then the teacher gives them Shakespeare’s version of the next step, and raises the next question.
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Proving the Sine and Cosine Rule

(13)
Using these sheets, students cut out the parts of the proof and attempt to place them in an order which makes mathematical sense. Students will often try and work out what makes sense to read before they understand how the Sine and Cosine rule works. Either way it helps more able students develop an understanding of the difference between demonstration and proof.