Scale Factor and
Missing Side Lengths
Remediation Powerpoint
Scale Factor Facts
Scale Factor Facts!
If the scale factor is 3, the new figure is
3 times bigger than the original figure.
2x3=
Original figure
New figure
6 units
?
2 units
1 unit
?
units
1 x 33 =
All the sides of the new figure are 3 times
larger than the corresponding sides of the
original figure!
If the scale factor is ½ , the new figure is
½ the size of the original figure.
Original figure
New figure
4 units
2 unit
4x½=
?
2 units
2 x ½ 1= unit
?
All the sides of the new figure are ½ the
size of all the corresponding sides of
original figure!
Transform from the LARGE
figure TO SMALL figure.
Scale Figure will be
less than 1.
P
Pick sides on each figure that are similar.
AHP Process
( )
7
Transform from the SMALL
Pick TO
sides
on each
figure
LARGE
figure.
figure that are similar.
ENK
3
Scale Figure will be
greater than 1.
MNPQR Process
3.0÷1.2 = 2.5
1.2
(
TUVWX
) 3.0
Scaling Polygons Class‐work • Each student will receive a pair of similar figures (two copies)
• On sheet of paper, you will create two scenarios:
– Dilation from A to AA (or your letters)
– Dilation from AA to A (or your letters))
• Paste figures on the paper, label TO and From
• Create the appropriate 3CPC to calculate scale factor
• Specify scale factor and whether enlargement or reduction.