Chapter 19 Making Figures Congruent

Geometric figures can be described and compared using symmetry and congruence.

Vocabulary to learn;

line	line segment	angle
right angle	grid	ordered pair
congruent

Objectives;

To identify lines, line segments, and angles in plane figures.
To locate points on a grid.
To identify plane figures that are congruent.
To identify solid figures that are congruent.
To use visual models to make congruent figures.

Computer Lab Activities;

E-Lab #19 Making Congruent Figures
Carnival Countdown Pattern Block Roundup level L

Literature Links;

Grandfather Tang's Story ... tangram puzzles

Lesson 1 Line Segments and Angles

Looking at angles http://www.ies.co.jp/math/java/geo/rottri/rottri.html

Ladybug Math

Anglemania

Lesson 2 Locating Points on a Grid

An ordered pair of numbers names a point on a grid. The first number tells how many spaces to move to the right from zero. The second number tells how many spaces to move up.

The Star is at ( 1, 2)

The sun is at ( 4, 1). Where is the smiley face?

Try your luck at these online sites for grids;

Lesson 4 Using Congruent Figures

E-Lab #19 download activity page

Congruent figures are the same size and shape but have different placement on a plane.

Carol's Congruent Concentration

Lesson 5 - Congruent Solid Figures

Use Legos or blocks to build solid figures that have the same size and shape... that are congruent.

Chapter 19 Assessment

1. An ________________ is formed where two line segments meet.	2. An _______ of numbers names a point on a grid.
3. A _________________ is straight and does not end.	4. A ___________________ is straight and is the part of a line between two endpoints.
5. A ____________________ is a map divided into equal squares.	6. When two objects are the same size and shape, they are said to be ____________________.
	7. How many line segments are in this shape? 8. Is angle A more than a right angle, less than a right angle, or is it a right angle? 9. Is angle B more than a right angle, less than a right angle, or is it a right angle?
	10. What is at (1,2)? ______________ 11. Where is the triangle? _________ 12. What is the moon? ____________
Explain why they are not congruent using exact words and in complete sentences.