“Geometry” Is A Verb: Making Elementary School Geometry ...ksuweb.kennesaw.edu/~twatanab//GeometryWorksheets.pdfGeometry is a verb Workshop @ 2009 NCTM Tad Watanabe Kennesaw State

Geometry is a verb Workshop @ 2009 NCTM

Tad Watanabe Kennesaw State University e-mail: [email protected]

“Geometry” Is A Verb:

Making Elementary School

Geometry Come Alive

Tad Watanabe

Kennesaw State University [email protected]

Presentation slides and worksheets may be downloaded from:

http://science.kennesaw.edu/~twatanab/


Tad Watanabe Kennesaw State University http://science.kennesaw.edu/~twatanab/Geometry.pdf



Using Compass

1 Draw a circle with the following radius:

a) 2 cm b) 3 cm

2 Use your compass to mark off as many 3 cm segments as you can:

3 Which traveling distance is longer, from Takashi’s house to the City Hall or from

Takashi’s house to the School?



Let's make some beautiful designs. Using your compass, make some designs on the grid paper below.



Drawing Triangles

1 Let’s think about how to draw an isosceles triangle with sides of 4 cm, 4 cm and 3 cm.

First, draw the 3 cm side.

2 Let’s draw the following triangles:

a) an isosceles triangle with sides of 10 cm, 7 cm and 7 cm.

b) an isosceles triangle with sides of 5 cm, 5 cm, and 6 cm.



3 Let’s think about how to draw an equilateral triangle with sides that are 5 cm each.

4 Let’s draw many triangles using radii of the circle shown below.

A

B

C

D



Drawing Perpendicular and Parallel Lines

1 Draw a pair of perpendicular lines.

2



3 The lines below are parallel to each other. Draw several line segments that are

perpendicular to both and measure their lengths.

4

5 Draw a rectangle 5 cm long and 7 cm wide using two set squares.



Trapezoids, Parallelograms, and Rhombuses

1 Draw a trapezoid by drawing two parallel lines and 2 other lines.

2



3

4



Exploring Diagonals

1 Let’s investigate the characteristics of diagonals in quadrilaterals! a. Compare the lengths of the two diagonals. b. Compare the lengths of the four line segments between the intersection of

the diagonals and the four vertices. c. Compare the angles formed by the two diagonals at the point of

intersection.



Congruent Triangles

Let’s draw B’C’ that is the same length as BC. Let’s think about different ways we can

find point A’.

Documents

“Geometry” Is A Verb: Making Elementary School Geometry ...ksuweb.kennesaw.edu/~twatanab//GeometryWorksheets.pdfGeometry is a verb Workshop @ 2009 NCTM Tad Watanabe Kennesaw State