TEXTS for Math 371:
Week  Class Topic 
Class Tasks 

1 127 
Introduction to geometry technology. Points,
lines, circles, intersections, figures, labels, and text. 
Introduction to GeoGebra. 
2 23 
More on points, lines, and using GeoGebra online.

Download File from GeoGebra Tube Examine File. Construct a sketch with technology of 1. Euclid's Proposition 1 in Book I. 
3 210 

2. Euclid's Proposition 2 in Book I. 3. One "proof" of the Pythagorean Theorem. Do Construction 3, 4, 6, 7, and 8 from Meserve and Izzo Section 1.2. BONUS:Show how to "add" two arbitrary triangles to create a single square. 
4 217 
Transformations that preserve distance: Translations, Rotations, Reflections, Glide Reflections. 
1. Construct a scalene
triangle .
Illustrate how to do i) a translation by a given "vector", ii) a
rotation
by a given angle measure, and iii) reflections across a given line..
2. Create a sketch that shows that the product of two reflections is either a translation or a rotation 
5 224 
Measurements. Central Similarities. Other Magnifications. Parameters(?) / Slider 
Problem
1
now
due
2/22 1. Draw a figure showing the product of three planar reflections as a glide reflection. 2. Draw a figure illustrating the effects of a central similarity on a triangle using magnification or dilation that is a) positive number >1, b) a positive number <1, and c) a negative number. 
6 32 
Rotations of lines about the point of
intersection. More on use of angle measurements and perpendicular lines. 
1. Construct the inverse
of a point with respect
to a circle a) when the point is inside the circle; b) when the point
is
outside the circle. 2. Given a circle O and two interior points A and B, construct an orthogonal circle O' through A and B. 3. Draw two intersecting circles O and O' and measure the angle between them. 
7 39 
Draw sketches for each of
the following triangle
coincidences: 1. Medians. 2. Angle Bisectors. 3. Altitudes. 4. Perpendicular Bisectors 

Spring break  
8 323  1. Inversion: Investigate and sketch the result
of inversion on lines
and circles in the plane with a given circle for inversion. When does a line invert to a line? When does a line invert to a circle? When does a circle invert to a line? when does a circle invert to a circle? Show sketches where each case occurs. [ Remember the inverse of the inverse is the original figure.] 2. Use inversion with respect to the circle OP to invert <BAC to <B'A'C'. Discuss briefly the effects of inversion on angles. 

9 330 
NO Meeting 

10 46 
Draw a sketch of the affine plane showing the horizon line and label the lines X=1,2,1, Y= 1,2,1 and points (1,2) and (2,1).  
11 413 
Traces?  1.
Using
trace
features, draw a parabola, ellipse and hyperbola from focus
(and directrix). 2. Use built in features of software to draw a parabola, ellipse and hyperbola from focus (and directrix). 
12 420 
A.1. Construct a sketch showing ABC on a line
perspectively related to
A'B'C' on a second line with center O. 2. Construct a sketch of ABC on a line projectively (but not perspectively) related to A'B'C' on a second line. Show two centers and an intermediate line that gives the projectivity. B.1'. Draw a dual sketch for the figure in problem 1. 2'. Draw a dual sketch for the figure in problem 2. C. Draw a sketch for Desargues' theorem in the plane. 

13 427 
Pascal's
configuration: Hexagons inscribed
in conics. Points of intersections of opposite sides lie on a single
line. Construct a figure for Pascal's configuration with a) an ellipse , b)a parabola, and c) an hyperbola. 

14 54 
A. Draw a figure in space that illustrates
the "conic sections". B. Draw a spatial sketch for Desargues' Theorem 

???  1.Draw a sketch showing H(AB,CD) and H(CD, AB) are equivalent. [Proof.] 2. Draw a sketch that shows that if H(AB,CD) and H(AB,CD*) then D= D*.[Proof.] 