Make geometric constructions
Grade:
Common Core/Essential
Standard #:
G.CO.12
Course:
Unit:
Description:
Instructional Days:
Make formal geometric constructions with a
variety of tools and methods (compass and
straightedge, string, reflective devices, paper
folding, dynamic geometric software, etc.)
Copying a segment; copying and angle; bisecting
a segment; bisecting an angle; constructing
perpendicular lines, including the perpendicular
bisector of a line segment; and constructing a
line parallel to a given line through a point not
on the line
Learning Targets:
Recommended Resources:
I can identify the tools used in formal constructions.
Phschool.com-videos, quizzes, and tutorials
(K)
I can use tools and methods to precisely copy a
PH textbook
segment, copy an angle, bisect a segment, bisect an
angle, construct perpendicular lines and bisectors, and PH textbook Common Core State Standards
construct a line parallel to a given line though a point
not on the line. (P)
Tenmarks.com
I can informally perform the constructions listed above
using string, reflective devices, paper folding, and/or
www.kutasoftware.com Free Geometry Worksheets (Basic
dynamic geometric software. (P)
Constructions)
Sketchpad
Essential Terminology:
Segment, angle, perpendicular lines, perpendicular
bisector, parallel lines, bisect, formal construction ,
informal construction, compass, straightedge
Online (only links specific to this standard):
Tenmarks.com
www.kutasoftware.com Free Geometry Worksheets (Basic
Constructions)
Phschool.com-videos, quizzes, and tutorials
Sketchpad
Essential Readings:
PH Geometry Textbook: 1.5 Basic Constructions pg. 34-37
Essential Question:
In what ways can congruence be useful?
Make geometric constructions
Enduring Understandings:
Proving and applying congruence provides a basis for modeling situations geometrically.
Activating Strategy: Students use a compass, protractor, and ruler to construct a perpendicular bisector, angle
bisector, and a midpoint of a segment.
Suggested Instructional Tasks:
Literacy Component: Reading
Writing:
Describe how to construct the midpoint of a segment,
perpendicular bisector, and an angle bisector.
Summarizing Strategy:
Support for Differentiation:
ELL
EC
Sample Formative Assessment (aligned to Learning Target):
AIG