Conjectures and Geometry - Lesson 4 - Proofs That are Not Valid

With all this talk of reasoning and proofs and truth, it is important to be able to see what makes up a valid deductive proof, and especially how to spot the holes in deductive reasoning that isn't valid.

Complete the excercise "INVESTIGATE the Math" about the triangles on the grid that are the intro to Lesson 1.5: Proofs that are not valid, then finish reading through the lesson You can also have the lesson read to you. |

Ok now for some practice. |

Finally, here is a video that goes through the textbook line by line:

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