Use Axioms, Proposition 1, Mauney’s Postulate, and Congruence Theorems SAS and SSS to bisect a given line segment. Also, construct a line perpendicular.

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Presentation transcript:

Use Axioms, Proposition 1, Mauney’s Postulate, and Congruence Theorems SAS and SSS to bisect a given line segment. Also, construct a line perpendicular to a given line segment.

How do we define a right angle, today? According to Euclid, what is a right angle? Why did Euclid define right angle in such a strange way?

When a straight line standing on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands.

A B C D

A B C D

A B C D O

A B C

A B C O

Math/lLogic Homework for Monday, May 2 1.Mauney’s Postulate 2.Area Workshop 3.Polished perpendicular bisector proof 4.Formal deduction from some Holmes book.