thursday, january 26th

52
Thursday, January 26th Please complete the warm up and write down homework Warm Up 1. How do you know if two shapes are similar? 2. Sharon bought a shirt for $42.50 and a pair of jeans for $52.75. If there’s a 8% sales tax. What will the total be?

Upload: kellsie

Post on 14-Feb-2016

24 views

Category:

Documents


0 download

DESCRIPTION

Thursday, January 26th. Please complete the warm up and write down homework. Warm Up. How do you know if two shapes are similar? S haron bought a shirt for $42.50 and a pair of jeans for $52.75. If there’s a 8% sales tax. What will the total be?. Corny Joke of the Day. - PowerPoint PPT Presentation

TRANSCRIPT

Page 1: Thursday,  January  26th

Thursday, January 26th• Please complete the warm up and write

down homework

Warm Up1. How do you know if two shapes are

similar?

2. Sharon bought a shirt for $42.50 and a pair of jeans for $52.75. If there’s a 8% sales tax. What will the total be?

Page 2: Thursday,  January  26th

Corny Joke of the Day

What type of animal needs oil?

Mice because they

“squeak”

Page 3: Thursday,  January  26th

Have you used your holiday present yet?

Staple your extra 10 points to any Homework, Quiz, or

Classwork assignment Turn it into the math bin

Page 4: Thursday,  January  26th

Checkpoint Answers Scored out of 14

GREAT JOB!!!! Remember to watch your decimal

placements

Page 5: Thursday,  January  26th

Symmetry Preview

Write down your definition of

symmetry and draw examples that you think represent it!

Page 6: Thursday,  January  26th

Symmetry

Page 7: Thursday,  January  26th

OUR MISSION

Learn to identify line symmetry and learn how to rotate figures!

Page 8: Thursday,  January  26th

A figure has line symmetry if it can be folded or reflected so that the two parts of the figure match, or are congruent. The line of reflection is called the

line of symmetry.

What is it?

Page 9: Thursday,  January  26th

Part 1 Lines of symmetry in regular polygons

Regular polygons: All side lengths and angles are

congruent

Page 10: Thursday,  January  26th

Can you find the rule?Find the number of lines of

symmetry in each shape and fill out the chart.Shape Number of Sides Lines of symmetry

Triangle

Square

Pentagon

Hexagon

Octagon

Page 11: Thursday,  January  26th

4 lines of symmetry

Page 12: Thursday,  January  26th

DiscoveryFor a regular

polygon the lines of symmetry is the same as

the number of sides!

Page 13: Thursday,  January  26th

Fun FactA dodecagon is a 12-

sided regular polygon. This means that it has

___________lines of symmetry!

Page 14: Thursday,  January  26th

Part 2 Determining if the lines given are the lines

of symmetry

Page 15: Thursday,  January  26th

Determine whether each dashed line appears to be a line of symmetry.

The two parts of the figure appear to match exactly when folded or reflected across the line.

The line appears to be a line of symmetry.

#1

Page 16: Thursday,  January  26th

Determine whether each dashed line appears to be a line of symmetry.

The two parts of the figure do not appear congruent.

The line does not appear to be a line of symmetry.

#2

Page 17: Thursday,  January  26th

Determine whether each dashed line appears to be a line of symmetry.

The two parts of the figure do not appear congruent.

The line does not appear to be a line of symmetry.

#3

Page 18: Thursday,  January  26th

Determine whether each dashed line appears to be a line of symmetry.

The two parts of the figure appear to match exactly when folded or reflected across the line.

The line appears to be a line of symmetry.

#4

Page 19: Thursday,  January  26th

Group DiscussionHow many lines of symmetry does the following shape have?

Page 20: Thursday,  January  26th

NOT EVERY SHAPE HAS A

LINE OF SYMMETRY

Page 21: Thursday,  January  26th

Does this have a line of symmetry?

Page 22: Thursday,  January  26th

1 line of symmetry

Is there a line of symmetry. If so, how many?

Smile Symmetry

Page 23: Thursday,  January  26th

Corporate Logos Find the symmetry

Page 24: Thursday,  January  26th
Page 25: Thursday,  January  26th

Class Discussion 1. Situations that demonstrate

reflection

2. Situations that demonstrate rotation?

Page 26: Thursday,  January  26th

Transformations

Page 27: Thursday,  January  26th

Cut out the first letter to your name!

Page 28: Thursday,  January  26th

A rigid transformation moves a figure without changing its size or shape. So the original figure and the transformed figure are always congruent.

The illustrations of the alien will show three transformations: • A rotation• A reflection• A translation*Notice the transformed alien does not change in size or shape.

Page 29: Thursday,  January  26th

Type #1 Rotational

Page 30: Thursday,  January  26th

A rotation is the movement of a figure around a point. A point of rotation can be on or outside a

figure.

The location and position of a figure can change with a rotation.

Page 31: Thursday,  January  26th

The figure moves around a point.

It is a rotation.

Example #1

Page 32: Thursday,  January  26th

The figure moves around a point.

It is a rotation.

Example #2

Page 33: Thursday,  January  26th

Rotations are measured by Degrees.

Rotations can turn Clockwise or Counter Clockwise

Page 34: Thursday,  January  26th

Clockwise“like a clock”

Counter-Clockwise“opposite of a

clock”

Page 35: Thursday,  January  26th

90°

180°

360°

• A full turn is 360°• of a turn is ¼ 90°• of a turn is ½180°• of a turn is ¾270°

Page 36: Thursday,  January  26th

Just Watch! Draw a 180° rotation about the point

shown.

Trace the figure and the point of rotation.Place your pencil on the point of rotation.Rotate the figure 180°.Trace the figure in its new location.

Page 37: Thursday,  January  26th

Draw each transformation.Draw a 180° clockwise rotation about the point shown.

Trace the figure and the point of rotation.Place your pencil on the point of rotation.Rotate the figure 180°.Trace the figure in its new location.

A AYou Try #1!

Page 38: Thursday,  January  26th

Draw each transformation.Draw a 90° counter clockwise rotation about the point shown.

Trace the figure and the point of rotation.Place your pencil on the point of rotation.Rotate the figure 90° Trace the figure in its new location.

K

You Try #2! K

Page 39: Thursday,  January  26th

Type #2 Reflection

Page 40: Thursday,  January  26th

When a figure flips over a line, creating a mirror image, it is called a reflection. The line the figure is flipped over is called line of reflection.

The location and position of a figure change with a reflection.

Page 41: Thursday,  January  26th

There are 2 types!

Horizontal: flips ACROSS

Vertical: flips UP and DOWN

Page 42: Thursday,  January  26th
Page 43: Thursday,  January  26th

Practice Problems1. Reflect Vertically

2. Reflect horizontally

J

B

Page 44: Thursday,  January  26th

TYPE #3 TRANSLATION

Page 45: Thursday,  January  26th

A translation is the movement of a figure along a straight line.

Only the location of the figure changes with a translation.

Page 46: Thursday,  January  26th

WHITEBOARD PRACTICE

Determine the transformation!

Page 47: Thursday,  January  26th

The figure is flipped over a line.

It is a reflection.

Page 48: Thursday,  January  26th

The figure is moved along a line.

It is a translation.

Page 49: Thursday,  January  26th

The figure moves around a point.

It is a rotation.

Page 50: Thursday,  January  26th

The figure is flipped over a line.

It is a reflection.

Page 51: Thursday,  January  26th

The figure moves around a point.

It is a rotation.

Page 52: Thursday,  January  26th

The figure is moved along a line.

It is a translation.