Transcript Wee Grid
Enlargement and Reduction
What is to be learned?
• How to enlarge (and reduce) shapes mathematically
Enlargement
Shape gets bigger!
Let’s be more mathematical
Enlargement Double
the size Every Line Doubles (
Scale Factor
= 2) Original
6 3 4 8
Enlargement
Tactics
Draw original first
Enlargement
Leave tricky lines till last
Double
the size
2 5
Original
4 10
Enlargement
Leave tricky lines till last
More Difficult
Two Tricky Lines!
8 Double
the size
4 4 3
Original
2 8 6
Enlargement
4
Reduction
Shape gets smaller!
Tactics Reduction
Draw original first Leave tricky lines till last
Half
the size (
Scale Factor
= ½ )
4 6
Original
6 3 2 3
Reduction
Enlargement and Reduction in Real Life
Photographs Models
Enlargement/Reduction Steps to Success
Multiply
all
lines by
Scale Factor
Leave tricky lines till last
Scale Factor 2 3 4
Original
6 8
Enlargement
The Test of Success
What is to be learned?
How to enlarge (and reduce) shapes mathematically
Scale Factor = ½
Steps to success Multiply
all
lines by
Scale Factor
Leave tricky lines till last
8 4
Original
2 4 1 2
Reduction