Transformational Plane Geometry by Ronald N. Umble, Zhigang Han

By Ronald N. Umble, Zhigang Han

Designed for a one-semester path on the junior undergraduate point, Transformational aircraft Geometry takes a hands-on, interactive method of instructing aircraft geometry. The ebook is self-contained, defining uncomplicated ideas from linear and summary algebra steadily as needed.

The textual content adheres to the nationwide Council of lecturers of arithmetic Principles and criteria for college Mathematics and the typical middle country criteria Initiative Standards for Mathematical Practice. destiny lecturers will gather the talents had to successfully follow those criteria of their study rooms.

Following Felix Klein’s Erlangen Program, the e-book presents scholars in natural arithmetic and scholars in instructor education courses with a concrete visible replacement to Euclid’s simply axiomatic method of airplane geometry. It permits geometrical visualization in 3 ways:

  1. Key ideas are encouraged with exploratory actions utilizing software program particularly designed for appearing geometrical buildings, resembling Geometer’s Sketchpad.
  2. Each proposal is brought synthetically (without coordinates) and analytically (with coordinates).
  3. Exercises comprise various geometric structures that use a reflecting software, corresponding to a MIRA.

After reviewing the basic ideas of classical Euclidean geometry, the e-book covers common variations of the aircraft with specific cognizance to translations, rotations, reflections, stretches, and their compositions. The authors observe those modifications to check congruence, similarity, and symmetry of aircraft figures and to categorise the isometries and similarities of the plane.

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Additional resources for Transformational Plane Geometry

Sample text

7). By the Exterior Angle Theorem, µ(∠ABB ) > µ(∠C B B) and the alternate interior angles ∠ABB and ∠C B B are not congruent. By the same argument, the other pair of alternate interior angles ∠A B B and ∠CBB are not congruent. (⇒) Assume that l l . 7). Then l l by the converse proved above. Since B is on both l and l , and both are parallel to l, l = l by the Euclidean Parallel Postulate. Thus the alternate interior angles formed by l and l with transversal t are congruent. 7. Proof of the Alternate Interior Angles Theorem.

By definition, M is a midpoint of AB. This proves existence. We leave the proof of uniqueness as an exercise for the reader. 6 Transformational Plane Geometry Exercises 1. Let f : l → R be a coordinate function for line l. Prove that (a) For every constant c ∈ R, the function g : l → R defined by g(X) = f (X) + c is also a coordinate function for l. (b) The function h : l → R defined by h(X) = −f (X) is also a coordinate function for l. −−→ −→ 2. Let A, B, and C be three distinct points such that AB = AC.

Definition 14 Let A and B be distinct points. A point M is a midpoint of AB if A − M − B and AM = M B. Theorem 15 (Existence and Uniqueness of Midpoints) Let A and B be distinct points. Then AB has a unique midpoint. Proof. Let A and B be distinct points. We first prove that there exists a ←→ point M such that M is a midpoint of AB. Consider the unique line l = AB given by the Incidence Postulate. By the Ruler Placement Postulate, there is a coordinate function f : l → R such that f (A) = 0 and f (B) = b > 0.

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