tuesday, january 31 st
DESCRIPTION
Tuesday, January 31 st. Please get a new warm up and complete Please take out HW (pictures, cartoon, and worksheet). Warm Up. If two shapes are similar and the given shape has an area of 12 in ². What would be the area of the resulting shape if the scale factor is 8 - PowerPoint PPT PresentationTRANSCRIPT
Tuesday, January 31st • Please get a new warm up and complete• Please take out HW (pictures, cartoon, and
worksheet)
Warm Up1. If two shapes are similar and the given
shape has an area of 12 in . What would ²be the area of the resulting shape if the scale factor is 82. If two shapes are similar and the given
shape has a perimeter of 84 cm. What would be the perimeter of the resulting shape of if the scale factor is 7.5
Corny Joke of the Day What’s harder to catch
the faster you run?
Your breath
What did Selena do wrong?
Find the Missing side length given the two
similar shapes
12
45
15 x
15 4512
45 3 15,12 3 4
x
so
Important
Test #2 Friday
February 3rd
Homework Answers
Rotation SymmetryExtension
Review
• A figure has rotational symmetry if, when it is rotated (turned) less than 360° around a central point, it coincides with itself (Looks exactly the same)
• The central point is called the center of rotation.
• A figure that coincides with itself after a rotation of 180° has rotational symmetry
Determining Rotation Symmetry
Tell how many times each figure will show rotational symmetry within one full rotation.
Draw lines from the centerof the figure out throughidentical places in the figure.
Count the number of linesdrawn.
The figure will show rotational symmetry 4 times within a 360° rotation.
Tell how many times each figure will show rotational symmetry with one full rotation.
Draw lines from the center of the figure out throughidentical places in the figure.Count the number of lines drawn.
The figure will show rotational symmetry 3 times within a 360° rotation.
Tell how many times each figure will show rotational symmetry within one full rotation.
Insert Lesson Title Here
Draw lines from the center of the figure out through identical places in the figure.Count the number of lines drawn.
The figure will show rotational symmetry 4 times within a 360° rotation.
Practice Time
Degree of RotationThe smallest number of degrees
that a figure can be turned and still look identical to itself.
Trace the following figure. Rotate the figure and determine the degree of rotation (what degree does it start looking identical to the original?)
Finding the Degree of Rotation
Can be found by:
360° ÷ # of lines of symmetry
Practice Time
Scale Factor ProjectStep 1:
Complete tasks 1-2 using a ruler Measure in Centimeters, round to the nearest 10th
Scale Factor ProjectStep 2:
Find the SCALE FACTOR: Resulting/GivenUse the SCALE FACTOR to find perimeter and Area for question 4
Scale Factor ProjectStep 3:
Answer questions 6-8
Scale Factor ProjectStep 4:
Paste your comic on the small graph paper
Scale Factor ProjectStep 5:
With a ruler, lightly draw in the grid lines
Scale Factor ProjectStep 6:
Answer question 9. Find the perimeter and area of your original comic
Scale Factor ProjectStep 7:
Draw each square in the enlarged grid box