Plans And Paragraph Proofs

The focus of this lesson is on using transformation geometry to prove a conjecture. We have chosen
a particular definition of a kite to work from. When talking about kites, it is useful to refer to their vertex
angles (the angles between each pair of equal adjacent sides) and their non-vertex angles (the angle
between two sides that are not equal) separately. Your learners may choose a different definition as
their starting point, so their investigations may take a different path.
If your learners have not seen our series, Investigating Geometry 1, you could show them lesson 5
of that series, which demonstrates how to write a plan for a proof and how to write a paragraph
proof. Paragraph proofs help learners to develop confidence in writing proofs. They allow learners to
focus on making sense of the proof without worrying about the layout of the proof. So don’t skip this
important step.

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